Keep the native digest list and manifest LF on every checkout

Soul found that on a Windows clone (core.autocrlf=true) SHA256SUMS and
MANIFEST.txt were written with CRLF, so the documented
`sha256sum -c SHA256SUMS` failed on every line: each filename ended in
\r. CI stayed green only because it checks out on Linux. After this
rule and a fresh checkout, the check passes on Starfire for all four
binaries.

Provenance, recorded here because verify-committed only checks the
committed files against the committed sums: run 35912901846 rebuilt
all four binaries from scratch after they were committed, and every
artifact is byte-identical to the committed file (libmsquic.so.2
c09a72f9..., libgamecult_mesh_quic_native.so 0ee3d283..., msquic.dll
c17c6581..., gamecult_mesh_quic_native.dll 9dae391a...). Two
independent CI builds produce the same bytes, which shows both where
they came from and that the build is reproducible.

Self edited this one-line config directly instead of dispatching Hands.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitattributes

@@ -1,2 +1,31 @@
 # Auto detect text files and perform LF normalization
 * text=auto
+
+# Shell scripts keep LF in the working tree as well as in the index. Left to
+# `text=auto`, a Windows clone writes them with carriage returns, and the
+# documented Linux path then dies inside the container in under a second: the
+# shebang reads as the interpreter `bash\r`, which does not exist. Nothing about
+# that failure names line endings, and the same clone builds and tests fine
+# everywhere else, so it reads as a broken image rather than a broken checkout.
+#
+# A clone checked out before this rule keeps its carriage returns, because the
+# blob is unchanged and git has no reason to rewrite the file. The one-line
+# repair is in native/GameCult.Mesh.Quic.Native/README.md, beside the container
+# path it unblocks.
+*.sh text eol=lf
+
+# The committed CultMesh QUIC native binaries (cut 6, packaging) ride the
+# deploy `git archive` as raw bytes. `* text=auto` already autodetects them as
+# binary by content, but that autodetection is a heuristic; say so explicitly
+# so no future text-processing rule (a diff driver, an export filter) can
+# apply text conversion and poison the committed digests in SHA256SUMS.
+packages/cultmesh-ts/native/**/*.dll binary
+packages/cultmesh-ts/native/**/*.so binary
+packages/cultmesh-ts/native/**/*.so.* binary
+
+# The digest list and manifest beside them keep LF on every checkout. Left to
+# `text=auto`, a Windows clone writes them with carriage returns, and the
+# documented `sha256sum -c SHA256SUMS` then fails on every line (each filename
+# ends in `\r`) while CI, checking out on Linux, stays green.
+packages/cultmesh-ts/native/SHA256SUMS text eol=lf
+packages/cultmesh-ts/native/MANIFEST.txt text eol=lf

.github/workflows/cultmesh-portability.yml

@@ -95,3 +95,46 @@ jobs:
           dotnet test tests/GameCult.Mesh.Tests/GameCult.Mesh.Tests.csproj
           --filter FullyQualifiedName~Document_OneHundredThousandDistinctLeaseCyclesLeaveNoResourcesOrCallbacks
           --logger "console;verbosity=minimal"
+
+      # The TypeScript side of the CultMesh authority rules. This job is the
+      # only one that runs on both Windows and Linux for main, codex/** and
+      # pull requests: cultnet-interop.yml is windows-latest and main-only, so
+      # until these steps existed the shared verifier's tests never ran on
+      # Linux at all, and the browser client's never ran in CI on any OS.
+      # packages/cultnet-ts verifies both vector files; cultmesh-browser proves
+      # the browser client reads the shared rules rather than its own.
+      - name: Verify the CultMesh authority rules with the TypeScript verifier
+        run: npm run test --workspace packages/cultnet-ts
+
+      - name: Verify the browser client against the shared TypeScript verifier
+        run: npm run test --workspace packages/cultmesh-browser
+
+      # The realtime frame codec. Its byte parity rests on two vector files,
+      # contracts/cultmesh/realtime-frame-vectors.json written by the C#
+      # reference and decoded by this step, and realtime-frame-vectors.ts-written.json
+      # written by this codec and decoded by the C# step below. Neither half ran
+      # in CI on any OS until these two steps existed, so a codec that agreed
+      # only with itself would have gone green.
+      - name: Verify the realtime frame codec with the TypeScript codec
+        run: npm run test --workspace packages/cultmesh-ts
+
+      # Both directions of the CultMesh authority vectors: the C#-written
+      # file (contracts/cultmesh/authority-route-vectors.json) and the
+      # TypeScript-signed file (authority-route-vectors.ts-signed.json) are
+      # verified by the C# reference here; the TypeScript side verifies both
+      # in the step above. CULTMESH_WRITE_VECTORS is never set in CI: the
+      # committed files are the contract.
+      - name: Verify the CultMesh authority vectors with the C# reference
+        run: >-
+          dotnet test tests/GameCult.Mesh.Tests/GameCult.Mesh.Tests.csproj
+          --filter FullyQualifiedName~AuthorityProof
+          --logger "console;verbosity=minimal"
+
+      # The other half of the frame parity: the C# reference decodes and
+      # re-encodes the vector file the TypeScript codec wrote. A fixture
+      # authored on one side alone would only agree with itself.
+      - name: Verify the realtime frame vectors with the C# reference
+        run: >-
+          dotnet test tests/GameCult.Mesh.Tests/GameCult.Mesh.Tests.csproj
+          --filter FullyQualifiedName~RealtimeWireProtocol
+          --logger "console;verbosity=minimal"

.github/workflows/cultnet-interop.yml

@@ -65,6 +65,32 @@ jobs:
           "KOTLIN_JAVA_HOME=$env:JAVA_HOME" | Out-File -FilePath $env:GITHUB_ENV -Append
           "$kotlinHome\bin" | Out-File -FilePath $env:GITHUB_PATH -Append
 
+      - name: Verify CultNet schema contracts stayed consolidated
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+          $stray = git ls-files '*.schema.json' | Where-Object { $_ -notmatch '^contracts/cultnet/' }
+          # -I skips binary files: unity/org.gamecult.cultlib/Runtime/Plugins/GameCult.Networking.dll
+          # still embeds the retired namespace until it is rebuilt (REC-032 D4, deferred).
+          $oldNamespace = git grep -I -lE 'GameCult/cultnet-ts/(integration/)?contracts' -- ':!.voidbot'
+          if ($LASTEXITCODE -eq 2) {
+            throw "git grep failed"
+          }
+          if ($stray) {
+            Write-Host "Schema files found outside contracts/cultnet/:"
+            $stray | ForEach-Object { Write-Host "  $_" }
+          }
+          if ($oldNamespace) {
+            Write-Host "Files still referencing the retired GameCult/cultnet-ts contracts namespace:"
+            $oldNamespace | ForEach-Object { Write-Host "  $_" }
+          }
+          if ($stray -or $oldNamespace) {
+            throw "CultNet schema contracts drifted out of contracts/cultnet/ (REC-032). See CultLib/contracts/cultnet/ and rewrite any `$id back to https://github.com/GameCult/CultLib/contracts/cultnet/."
+          }
+          # git grep exits 1 when nothing matches, and the runner's pwsh wrapper
+          # ends the step with that $LASTEXITCODE; a clean tree must pass.
+          exit 0
+
       - name: Install Node dependencies
         run: npm install --no-package-lock
 

.github/workflows/publish-packages.yml

@@ -42,8 +42,12 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
+      # fetch-depth: 0 so the semver check below can see every previously
+      # published tag, not just the one that triggered this run.
       - name: Check out CultLib
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Set up Node
         uses: actions/setup-node@v4
@@ -64,6 +68,19 @@ jobs:
             exit 1
           fi
 
+      # docs/semver-policy.md: a breaking change under too small a bump, or a
+      # version that skips or reverses the previous release, fails here
+      # instead of shipping with a number that lies.
+      - name: Verify semver policy
+        if: startsWith(github.ref, 'refs/tags/cultcache-ts-v')
+        run: |
+          tagged="${GITHUB_REF_NAME#cultcache-ts-v}"
+          node scripts/check-changelog-semver.mjs \
+            --package "@gamecult/cultcache-ts" \
+            --changelog packages/cultcache-ts/CHANGELOG.md \
+            --version "$tagged" \
+            --tag-prefix cultcache-ts
+
       - name: Build and test
         working-directory: packages/cultcache-ts
         run: npm test
@@ -105,9 +122,13 @@ jobs:
             echo "run=false" >> "$GITHUB_OUTPUT"
           fi
 
+      # fetch-depth: 0 so the semver check below can see every previously
+      # published tag, not just the one that triggered this run.
       - name: Check out CultLib
         if: steps.selected.outputs.run == 'true'
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Set up Python
         if: steps.selected.outputs.run == 'true'
@@ -115,6 +136,12 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Set up Node
+        if: steps.selected.outputs.run == 'true'
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24.x
+
       - name: Verify the tag matches the manifest version
         if: steps.selected.outputs.run == 'true' && startsWith(github.ref, 'refs/tags/')
         run: |
@@ -125,6 +152,19 @@ jobs:
             exit 1
           fi
 
+      # docs/semver-policy.md: a breaking change under too small a bump, or a
+      # version that skips or reverses the previous release, fails here
+      # instead of shipping with a number that lies.
+      - name: Verify semver policy
+        if: steps.selected.outputs.run == 'true' && startsWith(github.ref, 'refs/tags/')
+        run: |
+          tagged="${GITHUB_REF_NAME#${{ matrix.package }}-v}"
+          node scripts/check-changelog-semver.mjs \
+            --package "${{ matrix.package }}" \
+            --changelog packages/${{ matrix.package }}/CHANGELOG.md \
+            --version "$tagged" \
+            --tag-prefix "${{ matrix.package }}"
+
       # Lower layers install from source so a release of one package is tested
       # against the sibling revision it was cut with, not whatever PyPI has.
       - name: Install and test

.github/workflows/quic-native.yml

@@ -0,0 +1,202 @@
+name: CultMesh QUIC native
+
+# Builds and, on a tag, releases the CultMesh QUIC native binaries that
+# packages/cultmesh-ts/native/{win32-x64,linux-x64} commits (cut 6,
+# docs/typescript-quic-realtime-cut.md:2108-2159). Under Q8 Option 1 the
+# operator downloads a tagged run's Release assets, verifies every digest
+# against this workflow's own logs and SHA256SUMS, and commits the bytes;
+# nothing here writes to the tree. Under Q6 A, the Linux artifact comes only
+# from the pinned debian:13 container below, never from a local or Yggdrasil
+# build.
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "cultmesh-quic-native-v*"
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  # Push to main and pull_request run this job only: it proves the tree's
+  # committed bytes still match the manifest they shipped with. A tag push
+  # also runs it, alongside the two builds and the release.
+  verify-committed:
+    name: Verify committed binaries match SHA256SUMS
+    if: >-
+      github.event_name == 'pull_request' ||
+      (github.event_name == 'push' &&
+        (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/cultmesh-quic-native-v')))
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Check out CultLib
+        uses: actions/checkout@v4
+
+      - name: sha256sum -c SHA256SUMS
+        run: |
+          set -euo pipefail
+          if [ ! -f packages/cultmesh-ts/native/SHA256SUMS ]; then
+            echo "packages/cultmesh-ts/native/SHA256SUMS is missing" >&2
+            exit 1
+          fi
+          cd packages/cultmesh-ts/native
+          sha256sum -c SHA256SUMS
+
+  # workflow_dispatch and a cultmesh-quic-native-v* tag run the two builds.
+  # A dry (workflow_dispatch) run uploads artifacts and creates no release.
+  build-win32-x64:
+    name: Build win32-x64
+    if: >-
+      github.event_name == 'workflow_dispatch' ||
+      (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/cultmesh-quic-native-v'))
+    runs-on: windows-latest
+    timeout-minutes: 20
+    steps:
+      - name: Check out CultLib
+        uses: actions/checkout@v4
+
+      - name: Build the native QUIC bridge
+        shell: pwsh
+        run: .\scripts\build-quic-native.ps1 -OutputDirectory artifacts\quic-native\win32-x64
+
+      - name: Print toolchain version and digests
+        shell: pwsh
+        run: |
+          $ErrorActionPreference = "Stop"
+          $compilerCmake = Get-ChildItem -Recurse -LiteralPath "artifacts\quic-native-build\x64\Release" -Filter "CMakeCXXCompiler.cmake" |
+            Select-Object -First 1
+          if ($compilerCmake) {
+            Select-String -LiteralPath $compilerCmake.FullName -Pattern "CMAKE_CXX_COMPILER_VERSION" |
+              ForEach-Object { Write-Host $_.Line.Trim() }
+          }
+          Get-FileHash -Algorithm SHA256 artifacts\quic-native\win32-x64\gamecult_mesh_quic_native.dll
+          Get-FileHash -Algorithm SHA256 artifacts\quic-native\win32-x64\msquic.dll
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: quic-native-win32-x64
+          path: artifacts/quic-native/win32-x64
+          if-no-files-found: error
+
+  build-linux-x64:
+    name: Build linux-x64
+    if: >-
+      github.event_name == 'workflow_dispatch' ||
+      (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/cultmesh-quic-native-v'))
+    runs-on: ubuntu-latest
+    # Q6 A: this pinned Debian 13 container is the only permitted Linux
+    # release builder. The digest is the pin; the `debian:13` tag is only a
+    # label. The artifact links against this image's glibc (2.41); a bare
+    # ubuntu-latest runner carries glibc 2.39, which is not the deploy host's
+    # OS (docs/typescript-quic-realtime-cut.md:2192-2197).
+    container:
+      image: debian:13@sha256:f324c7ff54321e8d9c588493a20244965938ce0aa50bbd1022d38010e9ffc4b1
+    timeout-minutes: 20
+    steps:
+      - name: Check out CultLib
+        uses: actions/checkout@v4
+
+      - name: Install build tools
+        run: |
+          set -euo pipefail
+          apt-get update
+          apt-get install -y --no-install-recommends cmake ninja-build g++ curl ca-certificates dpkg
+
+      - name: Build the native QUIC bridge
+        run: ./scripts/build-quic-native.sh artifacts/quic-native/linux-x64
+
+      - name: Print toolchain version and digests
+        run: |
+          g++ --version
+          sha256sum artifacts/quic-native/linux-x64/libgamecult_mesh_quic_native.so
+          sha256sum artifacts/quic-native/linux-x64/libmsquic.so.2
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: quic-native-linux-x64
+          path: artifacts/quic-native/linux-x64
+          if-no-files-found: error
+
+  # Only this job has write permission, and only a tag push runs it. It
+  # attaches a draft MANIFEST.txt: the fields both build jobs cannot know
+  # (host names, MSVC version, the pinned dependency sources) are left for
+  # the operator to fill in from this run's own logs before committing the
+  # binaries, per 11.5's manifest paragraph.
+  release:
+    name: Release native binaries
+    needs: [build-win32-x64, build-linux-x64]
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/cultmesh-quic-native-v')
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      contents: write
+    steps:
+      - name: Check out CultLib
+        uses: actions/checkout@v4
+
+      - name: Download win32-x64 artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: quic-native-win32-x64
+          path: release/win32-x64
+
+      - name: Download linux-x64 artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: quic-native-linux-x64
+          path: release/linux-x64
+
+      - name: Write SHA256SUMS and a draft MANIFEST.txt
+        run: |
+          set -euo pipefail
+          cd release
+          # Relative paths matching packages/cultmesh-ts/native/ exactly, so
+          # this file is the one the operator commits verbatim (11.5, 11.7).
+          sha256sum \
+            win32-x64/gamecult_mesh_quic_native.dll \
+            win32-x64/msquic.dll \
+            linux-x64/libgamecult_mesh_quic_native.so \
+            linux-x64/libmsquic.so.2 \
+            > SHA256SUMS
+          cat > MANIFEST.txt <<EOF
+          # Draft written by ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}.
+          # The operator fills the remaining fields from this run's job logs
+          # (build-win32-x64 and build-linux-x64 each print their toolchain
+          # version) before committing packages/cultmesh-ts/native/MANIFEST.txt.
+          msquic.version=2.5.9
+          msquic.windows.source=
+          msquic.linux.source=
+          bridge.commit=${GITHUB_SHA}
+          build.workflow_run=${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}
+          build.release=${GITHUB_REF_NAME}
+          build.win32-x64.host=
+          build.linux-x64.host=
+          date=$(date -u +%Y-%m-%dT%H:%M:%SZ)
+          EOF
+          # Named after the upload-artifact names above, not after the parked
+          # scoped per-platform npm package names from the registry-publication
+          # seam (11.9): these are release archives, not npm packages, and
+          # 11.7's negative grep for that parked naming must stay clean.
+          tar -C win32-x64 -czf quic-native-win32-x64.tar.gz .
+          tar -C linux-x64 -czf quic-native-linux-x64.tar.gz .
+
+      - name: Create release
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          set -euo pipefail
+          cd release
+          gh release create "$GITHUB_REF_NAME" --verify-tag \
+            --title "$GITHUB_REF_NAME" \
+            --notes-file MANIFEST.txt \
+            quic-native-win32-x64.tar.gz \
+            quic-native-linux-x64.tar.gz \
+            SHA256SUMS \
+            MANIFEST.txt

contracts/cultmesh/authority-route-vectors.json

@@ -0,0 +1,44 @@
+{
+  "nowUnixMilliseconds": 1800000000000,
+  "odinRoot": {
+    "keyId": "odin-vector",
+    "x": "shJLGtmRrW6D87VQKv0xYQekLIfEkeN7dVawwpmIKWM=",
+    "y": "iR6Gx3aVCghzSyo7TqXqr+1397L73KDNZuzN2cZ55IE="
+  },
+  "route": {
+    "verseId": "aetheria",
+    "authorityRuntimeId": "aetheria-daemon",
+    "endpoint": "wss://provider.example/mesh",
+    "protocolIds": [
+      "cultmesh.content.v1",
+      "cultmesh.documents.v1"
+    ],
+    "priority": 7,
+    "generation": "vector-generation-1",
+    "certificate": {
+      "providerKey": {
+        "keyId": "provider-vector",
+        "x": "6XIvgx3W1q7lJFEV0yYbeKWNFgssq54BHBuh9gCwcH8=",
+        "y": "oi1FiKraueLic+VemzOx18MNwG6thmZMUWeqNw6vNOk="
+      },
+      "odinKeyId": "odin-vector",
+      "issuedAtUnixMilliseconds": 1799999940000,
+      "expiresAtUnixMilliseconds": 1800003600000,
+      "signature": "ZHuELFuCNNfbJt1T2mx1D9ZHXyxBedacDetmryMYhWKQxfROncltymkmL5KXl+1h8tDK6NytJCGy+7mYlb/DMA=="
+    }
+  },
+  "sessionProof": {
+    "request": {
+      "schemaVersion": "cultmesh.session_open.v2",
+      "messageId": "vector-message-1",
+      "sourceRuntimeId": "vector-consumer",
+      "verseId": "aetheria",
+      "authorityRuntimeId": "aetheria-daemon",
+      "protocolId": "cultmesh.documents.v1",
+      "routeGeneration": "vector-generation-1",
+      "clientNonce": "VczqjH8NdBaOb+rh8xb6P0xZjWD1el2ReNB8Vbp52ko="
+    },
+    "providerKeyId": "provider-vector",
+    "providerSignature": "6kGxSu/pwcR4lzh/7Av9nhblVIwIwVFzB7kY34vVvkpaFAbAxt8mWqIyZDTftE28G1g+NL4Ea41C3QsuImmkaA=="
+  }
+}

contracts/cultmesh/authority-route-vectors.ts-signed.json

@@ -0,0 +1,45 @@
+{
+  "nowUnixMilliseconds": 1800000000000,
+  "odinRoot": {
+    "keyId": "odin-ts-vector",
+    "x": "lqw9TE0EyuDU5Ghe8SafIbBBYkhHMUF7HXJQUc0nXsw=",
+    "y": "nUj+Xhakih97JiJcTUNMHM9JIo7MVQaauuAkCXph+tw="
+  },
+  "route": {
+    "verseId": "aetheria",
+    "authorityRuntimeId": "aetheria-daemon",
+    "endpoint": "cultmesh-state+quic://provider.example:4433/?cert-sha256=ABCDEF",
+    "protocolIds": [
+      "cultmesh.documents.v1",
+      "cultmesh.content.v1",
+      "cultmesh.realtime.v1"
+    ],
+    "priority": 13,
+    "generation": "ts-generation-ünïcode-∞-1",
+    "certificate": {
+      "providerKey": {
+        "keyId": "provider-ts-vector",
+        "x": "JKyjtWnoE5fhSWbeqr188SbReQWCjssf5mSMEa5pV+E=",
+        "y": "vtduzojDpbT49sbxBSsBQ+f3PG3rm+CUk/MTy2MM/ws="
+      },
+      "odinKeyId": "odin-ts-vector",
+      "issuedAtUnixMilliseconds": 1799999940000,
+      "expiresAtUnixMilliseconds": 1800003600000,
+      "signature": "NS5a7X8fNqTi1CdpPAcJaMmEsozwFRoygTW4z+JlhHFq7uaZcb4G7NwoEpPqo/Fv+UA7pNl5N+qUMuSD/oAq1Q=="
+    }
+  },
+  "sessionProof": {
+    "request": {
+      "schemaVersion": "cultmesh.session_open.v2",
+      "messageId": "ts-vector-message-1",
+      "sourceRuntimeId": "ts-vector-consumer",
+      "verseId": "aetheria",
+      "authorityRuntimeId": "aetheria-daemon",
+      "protocolId": "cultmesh.documents.v1",
+      "routeGeneration": "ts-generation-ünïcode-∞-1",
+      "clientNonce": "HICtAmV++1MarssY04Tkyn1j9qVEcOMp/P5Ce1M0Yec="
+    },
+    "providerKeyId": "provider-ts-vector",
+    "providerSignature": "OgJHkmw3fhPRS5TXxZm94yZvkWAV5TPDuvG+/zIVlnU7OFENZ0Nn0Pdx0IT/vDfEWXD+8/+sCZVFIFwa4tUjsg=="
+  }
+}

contracts/cultmesh/realtime-frame-vectors.json

@@ -0,0 +1,177 @@
+{
+  "frames": [
+    {
+      "label": "reliable-ordered, small payload",
+      "fields": {
+        "channelId": "aetheria.zone-1",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "body-7",
+        "producerEpoch": 1,
+        "sequence": 2,
+        "delivery": "reliable-ordered",
+        "payload": "AH+A/yo="
+      },
+      "encoding": "Q1NUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYABQAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03AH+A/yo=",
+      "encodedLength": 83,
+      "sha256OfEncoding": "d04539b99790560e5e570208d92d3ac25f85909a36bfeb190c2080288cc9f1d4"
+    },
+    {
+      "label": "latest-only, small payload",
+      "fields": {
+        "channelId": "aetheria.zone-1",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "body-7",
+        "producerEpoch": 3,
+        "sequence": 4,
+        "delivery": "latest-only",
+        "payload": "AQID"
+      },
+      "encoding": "Q1NUMQEDAAAAAAAAAAQAAAAAAAAADwAUAAYAAwAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03AQID",
+      "encodedLength": 81,
+      "sha256OfEncoding": "2c875718cf4968979f3cd4083ba2b279e8c03815ad3447c66037ee4530b2814a"
+    },
+    {
+      "label": "unreliable, small payload",
+      "fields": {
+        "channelId": "aetheria.zone-1",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "body-7",
+        "producerEpoch": 5,
+        "sequence": 6,
+        "delivery": "unreliable",
+        "payload": "/g=="
+      },
+      "encoding": "Q1NUMQIFAAAAAAAAAAYAAAAAAAAADwAUAAYAAQAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03/g==",
+      "encodedLength": 79,
+      "sha256OfEncoding": "b932adf333a0ca73d3a9077e15cf9062070a3084a50a3a30c3baa53312d864b1"
+    },
+    {
+      "label": "empty payload",
+      "fields": {
+        "channelId": "aetheria.zone-1",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "body-7",
+        "producerEpoch": 0,
+        "sequence": 0,
+        "delivery": "reliable-ordered",
+        "payload": ""
+      },
+      "encoding": "Q1NUMQAAAAAAAAAAAAAAAAAAAAAADwAUAAYAAAAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03",
+      "encodedLength": 78,
+      "sha256OfEncoding": "06c0362f2b395bf7855522190f6a59c45c46947ce7a9a4b8be115cf54a48f419"
+    },
+    {
+      "label": "multi-byte identities",
+      "fields": {
+        "channelId": "aetheria.zöne-∞",
+        "schemaId": "cultmesh.realtime.€1",
+        "bodyId": "bødy-\uD83D\uDD25",
+        "producerEpoch": 11,
+        "sequence": 12,
+        "delivery": "latest-only",
+        "payload": "cGF5bG9hZC3iiJ4="
+      },
+      "encoding": "Q1NUMQELAAAAAAAAAAwAAAAAAAAAEgAWAAoACwAAACUAAAABAGFldGhlcmlhLnrDtm5lLeKInmN1bHRtZXNoLnJlYWx0aW1lLuKCrDFiw7hkeS3wn5SlcGF5bG9hZC3iiJ4=",
+      "encodedLength": 98,
+      "sha256OfEncoding": "90c6ae8f1362d9e000aa57682612bb1d7606cabe2cd0c0969fdd07b816f44b1c"
+    },
+    {
+      "label": "epoch and sequence at long.MaxValue",
+      "fields": {
+        "channelId": "aetheria.zone-1",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "body-7",
+        "producerEpoch": 9223372036854775807,
+        "sequence": 9223372036854775807,
+        "delivery": "unreliable",
+        "payload": "Wg=="
+      },
+      "encoding": "Q1NUMQL/////////f/////////9/DwAUAAYAAQAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03Wg==",
+      "encodedLength": 79,
+      "sha256OfEncoding": "208068a668b48dc1abde9b3d7f025e7f7b6de6c480faea25c1383b6de9fd37ca"
+    },
+    {
+      "label": "identities at exactly 65535 UTF-8 bytes",
+      "fields": {
+        "channelId": {
+          "repeat": "ä€",
+          "byteLength": 65535
+        },
+        "schemaId": {
+          "repeat": "ۊ",
+          "byteLength": 65535
+        },
+        "bodyId": {
+          "repeat": "ñ€",
+          "byteLength": 65535
+        },
+        "producerEpoch": 13,
+        "sequence": 14,
+        "delivery": "reliable-ordered",
+        "payload": "ESI="
+      },
+      "encoding": null,
+      "encodedLength": 196644,
+      "sha256OfEncoding": "e3c1a353b606e86b35169efb875e76349dcfcb2d036973ee3bbe3c601fbda3e1"
+    },
+    {
+      "label": "64 MiB payload",
+      "fields": {
+        "channelId": "aetheria.zone-1",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "body-7",
+        "producerEpoch": 15,
+        "sequence": 16,
+        "delivery": "reliable-ordered",
+        "payload": {
+          "ramp": 67108864
+        }
+      },
+      "encoding": null,
+      "encodedLength": 67108942,
+      "sha256OfEncoding": "4d99183bdb450af854d87a81ba86a3a4c92ecc1b208675d916f1b75a9f1e7928"
+    }
+  ],
+  "malformed": [
+    {
+      "label": "truncated header",
+      "encoding": "Q1NUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACUAAAAB",
+      "message": "Realtime frame header is truncated."
+    },
+    {
+      "label": "wrong magic",
+      "encoding": "vFNUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJ",
+      "message": "Realtime frame magic is invalid."
+    },
+    {
+      "label": "wire version 2",
+      "encoding": "Q1NUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACUAAAACAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJ",
+      "message": "Realtime frame wire version is unsupported."
+    },
+    {
+      "label": "header size 36",
+      "encoding": "Q1NUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACQAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJ",
+      "message": "Realtime frame wire version is unsupported."
+    },
+    {
+      "label": "delivery 3",
+      "encoding": "Q1NUMQMBAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJ",
+      "message": "Realtime frame delivery mode is invalid."
+    },
+    {
+      "label": "delivery 255",
+      "encoding": "Q1NUMf8BAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJ",
+      "message": "Realtime frame delivery mode is invalid."
+    },
+    {
+      "label": "payload length -1",
+      "encoding": "Q1NUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAgCUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJ",
+      "message": "Realtime frame length is invalid."
+    },
+    {
+      "label": "length sum off by one",
+      "encoding": "Q1NUMQABAAAAAAAAAAIAAAAAAAAADwAUAAYAAwAAACUAAAABAGFldGhlcmlhLnpvbmUtMWN1bHRtZXNoLnJlYWx0aW1lLnYxYm9keS03CQkJAA==",
+      "message": "Realtime frame length is invalid."
+    }
+  ]
+}

contracts/cultmesh/realtime-frame-vectors.ts-written.json

@@ -0,0 +1,177 @@
+{
+  "frames": [
+    {
+      "label": "ts reliable-ordered, small payload",
+      "fields": {
+        "channelId": "ts.zone-a",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "ts-body-1",
+        "producerEpoch": 21,
+        "sequence": 22,
+        "delivery": "reliable-ordered",
+        "payload": "AAH+/w=="
+      },
+      "encoding": "Q1NUMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "encodedLength": 79,
+      "sha256OfEncoding": "68c264a42ce34e540e9dbee31dab5b73dec98c767f0b44591ce6a477cd17fc04"
+    },
+    {
+      "label": "ts latest-only, small payload",
+      "fields": {
+        "channelId": "ts.zone-a",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "ts-body-1",
+        "producerEpoch": 23,
+        "sequence": 24,
+        "delivery": "latest-only",
+        "payload": "f4A="
+      },
+      "encoding": "Q1NUMQEXAAAAAAAAABgAAAAAAAAACQAUAAkAAgAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xf4A=",
+      "encodedLength": 77,
+      "sha256OfEncoding": "3d4f49f4aa2c1f132c3a09ee83555c13e0bc036d636524a972e2829cf417b959"
+    },
+    {
+      "label": "ts unreliable, small payload",
+      "fields": {
+        "channelId": "ts.zone-a",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "ts-body-1",
+        "producerEpoch": 25,
+        "sequence": 26,
+        "delivery": "unreliable",
+        "payload": "pQ=="
+      },
+      "encoding": "Q1NUMQIZAAAAAAAAABoAAAAAAAAACQAUAAkAAQAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xpQ==",
+      "encodedLength": 76,
+      "sha256OfEncoding": "2c2faec604850959d44ee65d87d2ea59462b667c5d0db8565a8c159d75301851"
+    },
+    {
+      "label": "ts empty payload",
+      "fields": {
+        "channelId": "ts.zone-a",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "ts-body-1",
+        "producerEpoch": 0,
+        "sequence": 0,
+        "delivery": "latest-only",
+        "payload": ""
+      },
+      "encoding": "Q1NUMQEAAAAAAAAAAAAAAAAAAAAACQAUAAkAAAAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0x",
+      "encodedLength": 75,
+      "sha256OfEncoding": "6d2a04b399f32db4086e728194249b0279330ffa5517cdd82228f691a0f10708"
+    },
+    {
+      "label": "ts multi-byte identities",
+      "fields": {
+        "channelId": "ts.zøne-∂",
+        "schemaId": "cultmesh.realtime.µ1",
+        "bodyId": "ts-bödy-🧊",
+        "producerEpoch": 27,
+        "sequence": 28,
+        "delivery": "unreliable",
+        "payload": "dHMtcGF5bG9hZC3iiII="
+      },
+      "encoding": "Q1NUMQIbAAAAAAAAABwAAAAAAAAADAAVAA0ADgAAACUAAAABAHRzLnrDuG5lLeKIgmN1bHRtZXNoLnJlYWx0aW1lLsK1MXRzLWLDtmR5LfCfp4p0cy1wYXlsb2FkLeKIgg==",
+      "encodedLength": 97,
+      "sha256OfEncoding": "d5d22458bd50a446c7bdce4e2598fe8e5e7bfac3646d8fcd7215363c7c5c8ca1"
+    },
+    {
+      "label": "ts epoch and sequence at long.MaxValue",
+      "fields": {
+        "channelId": "ts.zone-a",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "ts-body-1",
+        "producerEpoch": 9223372036854775807,
+        "sequence": 9223372036854775807,
+        "delivery": "reliable-ordered",
+        "payload": "Bw=="
+      },
+      "encoding": "Q1NUMQD/////////f/////////9/CQAUAAkAAQAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xBw==",
+      "encodedLength": 76,
+      "sha256OfEncoding": "2abb67a876dc4ed006f33708b4c4dda55a90a6f95da7352749225195b10d45ba"
+    },
+    {
+      "label": "ts identities at exactly 65535 UTF-8 bytes",
+      "fields": {
+        "channelId": {
+          "repeat": "ü☃",
+          "byteLength": 65535
+        },
+        "schemaId": {
+          "repeat": "☃ü",
+          "byteLength": 65535
+        },
+        "bodyId": {
+          "repeat": "ç☃",
+          "byteLength": 65535
+        },
+        "producerEpoch": 29,
+        "sequence": 30,
+        "delivery": "latest-only",
+        "payload": "M0Q="
+      },
+      "encoding": null,
+      "encodedLength": 196644,
+      "sha256OfEncoding": "8bd4cd4c5232339f76b8e394eb93b66e8d14302398ecce2ae5bdb78070ef783a"
+    },
+    {
+      "label": "ts 64 MiB payload",
+      "fields": {
+        "channelId": "ts.zone-a",
+        "schemaId": "cultmesh.realtime.v1",
+        "bodyId": "ts-body-1",
+        "producerEpoch": 31,
+        "sequence": 32,
+        "delivery": "unreliable",
+        "payload": {
+          "ramp": 67108864
+        }
+      },
+      "encoding": null,
+      "encodedLength": 67108939,
+      "sha256OfEncoding": "f2c20e0b47a7681fbaeff6fcba024363542805de4cd95eeb7fa9f125ba646af0"
+    }
+  ],
+  "malformed": [
+    {
+      "label": "ts truncated header",
+      "encoding": "Q1NUMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAAB",
+      "message": "Realtime frame header is truncated."
+    },
+    {
+      "label": "ts wrong magic",
+      "encoding": "Q1OrMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "message": "Realtime frame magic is invalid."
+    },
+    {
+      "label": "ts wire version 2",
+      "encoding": "Q1NUMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAACAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "message": "Realtime frame wire version is unsupported."
+    },
+    {
+      "label": "ts header size 38",
+      "encoding": "Q1NUMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACYAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "message": "Realtime frame wire version is unsupported."
+    },
+    {
+      "label": "ts delivery 3",
+      "encoding": "Q1NUMQMVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "message": "Realtime frame delivery mode is invalid."
+    },
+    {
+      "label": "ts delivery 128",
+      "encoding": "Q1NUMYAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "message": "Realtime frame delivery mode is invalid."
+    },
+    {
+      "label": "ts payload length -1",
+      "encoding": "Q1NUMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAgCUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/w==",
+      "message": "Realtime frame length is invalid."
+    },
+    {
+      "label": "ts length sum off by one",
+      "encoding": "Q1NUMQAVAAAAAAAAABYAAAAAAAAACQAUAAkABAAAACUAAAABAHRzLnpvbmUtYWN1bHRtZXNoLnJlYWx0aW1lLnYxdHMtYm9keS0xAAH+/wA=",
+      "message": "Realtime frame length is invalid."
+    }
+  ]
+}

contracts/cultnet/cultmesh.session-accepted.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultmesh.session-accepted.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultmesh.session-accepted.schema.json",
   "title": "CultMesh Session Accepted",
   "type": "object",
   "required": ["schemaVersion", "messageId", "accepted", "verseId", "authorityRuntimeId", "protocolId", "routeGeneration", "clientNonce", "providerKeyId", "providerSignature"],

contracts/cultnet/cultmesh.session-open.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultmesh.session-open.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultmesh.session-open.schema.json",
   "title": "CultMesh Session Open",
   "type": "object",
   "required": ["schemaVersion", "messageId", "sourceRuntimeId", "verseId", "authorityRuntimeId", "protocolId", "routeGeneration", "clientNonce"],

contracts/cultnet/cultmesh.verse-catalog-request.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultmesh.verse-catalog-request.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultmesh.verse-catalog-request.schema.json",
   "title": "CultMesh Verse Catalog Request",
   "type": "object",
   "required": ["schemaVersion", "messageId"],

contracts/cultnet/cultmesh.verse-catalog-response.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultmesh.verse-catalog-response.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultmesh.verse-catalog-response.schema.json",
   "title": "CultMesh Verse Catalog Response",
   "type": "object",
   "required": ["schemaVersion", "messageId", "verses"],

contracts/cultnet/cultnet.database-change-raw.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.database-change-raw.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.database-change-raw.schema.json",
   "title": "CultNet Raw Database Change Message",
   "type": "object",
   "required": ["schemaVersion", "messageId", "subscriptionId", "changeKind"],

contracts/cultnet/cultnet.database-subscribe.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.database-subscribe.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.database-subscribe.schema.json",
   "title": "CultNet Database Subscribe Message",
   "type": "object",
   "required": ["schemaVersion", "messageId", "subscriptionId", "includeSnapshot"],

contracts/cultnet/cultnet.database-unsubscribe.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.database-unsubscribe.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.database-unsubscribe.schema.json",
   "title": "CultNet Database Unsubscribe Message",
   "type": "object",
   "required": ["schemaVersion", "messageId", "subscriptionId"],

contracts/cultnet/cultnet.document-delete.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.document-delete.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.document-delete.schema.json",
   "title": "CultNet Document Delete Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.document-mutation-contract.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.document-mutation-contract.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.document-mutation-contract.schema.json",
   "title": "CultNet Document Mutation Contract",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.document-put-raw.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.document-put-raw.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.document-put-raw.schema.json",
   "title": "CultNet Raw Document Put Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.document-put.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.document-put.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.document-put.schema.json",
   "title": "CultNet Document Put Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.document-record.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.document-record.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.document-record.schema.json",
   "title": "CultNet Document Record",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.error.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.error.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.error.schema.json",
   "title": "CultNet Error Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.hello.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.hello.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.hello.schema.json",
   "title": "CultNet Hello Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.login-success.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.login-success.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.login-success.schema.json",
   "title": "CultNet Login Success Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.login.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.login.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.login.schema.json",
   "title": "CultNet Login Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.operation-request.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.operation-request.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.operation-request.schema.json",
   "title": "CultNet Operation Request",
   "type": "object",
   "required": ["schemaVersion", "messageId", "serviceId", "operation", "payloadSchema", "payload"],

contracts/cultnet/cultnet.operation-response.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.operation-response.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.operation-response.schema.json",
   "title": "CultNet Operation Response",
   "type": "object",
   "required": ["schemaVersion", "messageId", "serviceId", "operation", "status", "payloadSchema", "payload"],

contracts/cultnet/cultnet.raw-document-record.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.raw-document-record.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.raw-document-record.schema.json",
   "title": "CultNet Raw Document Record",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.register.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.register.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.register.schema.json",
   "title": "CultNet Register Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.sample-change-name.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.sample-change-name.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.sample-change-name.schema.json",
   "title": "CultNet Sample Change Name Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.sample-chat.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.sample-chat.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.sample-chat.schema.json",
   "title": "CultNet Sample Chat Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.schema-catalog-request.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.schema-catalog-request.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.schema-catalog-request.schema.json",
   "title": "CultNet Schema Catalog Request Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.schema-catalog-response.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.schema-catalog-response.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.schema-catalog-response.schema.json",
   "title": "CultNet Schema Catalog Response Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.schema-descriptor.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.schema-descriptor.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.schema-descriptor.schema.json",
   "title": "CultNet Schema Descriptor",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.shard-catalog-request.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "cultnet.shard_catalog_request.v0",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.shard-catalog-request.schema.json",
   "type": "object",
   "required": ["schemaVersion", "messageId"],
   "additionalProperties": false,

contracts/cultnet/cultnet.shard-catalog-response.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "cultnet.shard_catalog_response.v0",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.shard-catalog-response.schema.json",
   "type": "object",
   "required": ["schemaVersion", "messageId", "shards"],
   "additionalProperties": false,

contracts/cultnet/cultnet.snapshot-request.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.snapshot-request.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.snapshot-request.schema.json",
   "title": "CultNet Snapshot Request Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.snapshot-response-raw.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.snapshot-response-raw.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.snapshot-response-raw.schema.json",
   "title": "CultNet Raw Snapshot Response Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.snapshot-response.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.snapshot-response.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.snapshot-response.schema.json",
   "title": "CultNet Snapshot Response Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.transport-profile.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.transport-profile.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.transport-profile.schema.json",
   "title": "CultNet Transport Profile",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.verify.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.verify.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.verify.schema.json",
   "title": "CultNet Verify Message",
   "type": "object",
   "required": [

contracts/cultnet/cultnet.witness-artifact-bundle.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/contracts/cultnet.witness-artifact-bundle.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.witness-artifact-bundle.schema.json",
   "title": "CultNet Witness Artifact Bundle",
   "type": "object",
   "required": [

contracts/cultnet/interop/cultnet.interop-note.schema.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "https://github.com/GameCult/cultnet-ts/integration/contracts/cultnet.interop-note.schema.json",
+  "$id": "https://github.com/GameCult/CultLib/contracts/cultnet/interop/cultnet.interop-note.schema.json",
   "title": "CultNet Interop Note",
   "type": "object",
   "required": [

docs/nuget-packaging.md

@@ -1,5 +1,8 @@
 # NuGet Packaging
 
+See `docs/semver-policy.md` for what a version bump on these packages is
+required to mean and how a release is checked against that before it ships.
+
 CultLib publishes the managed dependency graph as separate packages. The leaf
 package is `GameCult.Mesh`; its NuGet dependencies preserve the CultMesh,
 CultNet, and CultCache ownership boundaries.
@@ -19,5 +22,5 @@ closure through UPM rather than NuGet restore.
 Install the Unity package from the immutable release tag:
 
 ```text
-https://github.com/GameCult/CultLib.git?path=/unity/org.gamecult.cultlib#cultlib-unity-v1.0.46
+https://github.com/GameCult/CultLib.git?path=/unity/org.gamecult.cultlib#cultlib-unity-v1.0.57
 ```

docs/semver-policy.md

@@ -0,0 +1,213 @@
+# Semantic Versioning Policy
+
+Operator ruling, 2026-09-17: **semantic versioning is policy** for every
+package CultLib publishes, strictly. A release that removes or changes public
+surface incompatibly is a major bump, full stop — not a judgment call left to
+the person cutting the release.
+
+This document says what "breaking" means for each kind of surface this repo
+actually ships, and how a release is checked against it. See
+`docs/nuget-packaging.md` for how the managed/Unity packaging mechanics work;
+this document is the versioning contract those mechanics must satisfy.
+
+## The scar
+
+`org.gamecult.cultlib` 1.0.60 removed `CultInspectorAssetPath` — public API —
+and shipped as a patch bump. Its own changelog entry is titled "Breaking"; the
+version number said otherwise. A reviewer relying on the number alone would
+have missed it. This is recorded as history, not fixed by renumbering: `1.0.60`
+stays `1.0.60`. This policy, and the check below, exist so the next one is
+caught before it ships instead of written up afterward.
+
+## Packages in scope
+
+| Package | Kind | Tag prefix | Published by |
+| --- | --- | --- | --- |
+| `org.gamecult.cultlib` | Unity UPM | `cultlib-unity` | `scripts/build-unity-package.ps1`, consumed by git tag |
+| `org.gamecult.caching.unity` | Unity UPM | `caching-unity` | tagged directly (no build script; see "Coverage gaps") |
+| `org.gamecult.cultmath` | Unity UPM | `cultmath-unity` | `packages/cultmath/scripts/build-unity-package.ps1`, consumed by git tag |
+| `@gamecult/cultcache-ts` | npm | `cultcache-ts` | `.github/workflows/publish-packages.yml` |
+| `cultcache-py` | PyPI | `cultcache-py` | `.github/workflows/publish-packages.yml` |
+| `cultnet-py` | PyPI | `cultnet-py` | `.github/workflows/publish-packages.yml` |
+| `cultmesh-py` | PyPI | `cultmesh-py` | `.github/workflows/publish-packages.yml` |
+
+Rust crates are consumed as pinned git revisions (see `publish-packages.yml`'s
+own header comment) and are out of scope for tagged-release semver policing;
+a `Cargo.toml` version still exists and should follow this policy by
+convention, but nothing in this repo checks it mechanically today.
+
+Tag naming stays `<package>-v<version>` for every package above, matching the
+prefixes already in use.
+
+## What counts as breaking
+
+Semver's ordinary rule — additive is minor or patch, anything a consumer's
+existing code or data can no longer rely on is major — applies per surface as
+follows.
+
+### Managed public API (`org.gamecult.cultlib`, NuGet packages, `cultmath`)
+
+Breaking: removing or renaming a public type/member, changing a public
+member's signature or observable behavior in an incompatible way, tightening
+a public contract (new required parameter, narrowed accepted input),
+or moving a type across assemblies/namespaces without a compatible forwarder.
+
+Not breaking: adding a new public member, type, or overload; widening an
+accepted type; deprecating (marking obsolete) without removing.
+
+### Unity package inspector attributes (`org.gamecult.cultlib`,
+`org.gamecult.caching.unity`)
+
+These ship as ordinary public API by the rule above, but get their own
+callout because they are easy to mistake for "just editor tooling": an
+attribute class, its constructor shape, and the serialized value shape it
+reads/writes are all public surface a consumer's `[CultInspectorX(...)]`
+usage and serialized scene/prefab data depend on. Removing or renaming an
+attribute, or changing what it expects a annotated member's persisted value to
+look like (as `CultInspectorAssetPath` to `CultInspectorAssetGuid` did in
+1.0.60) is breaking.
+
+### Persisted wire format / store compatibility (CultCache)
+
+Governed by `src/GameCult.Caching/Contracts/cultcache-schema-compatibility.md`
+and `cultcache-persistence-format.md` — read those for the authoritative
+rules. In semver terms: anything those documents classify as **hard
+rejection** (type change, reference/value change, one-vs-many change, target
+schema change, name/index lookup semantics change, a persisted schema with no
+compatible local candidate) is breaking for any package that reads or writes
+the format. Anything classified as **soft-migratable drift** (compatible
+schema id drift, an ignorable missing slot, a defaultable missing slot) is not
+breaking on its own, but changing what counts as soft-migratable — loosening
+or tightening the drift rules themselves — is breaking for whichever package
+owns that classification logic.
+
+### CultNet protocol surface
+
+Breaking: a wire-incompatible change to a CultNet message, frame, or
+handshake shape; removing or repurposing a message type or field that another
+runtime's implementation depends on; changing routing, authority, or trust
+semantics such that a peer built against the previous protocol version
+misbehaves rather than cleanly failing. Additive, backward-compatible framing
+changes (a new optional field a receiver may ignore) are not breaking.
+
+### Native bridge exported functions (`GameCult.Mesh.Quic.Native`)
+
+Breaking: removing or changing the signature/ABI of a `CULTMESH_API`
+(`extern "C"`) exported function, or changing an exported function's
+behavior such that the existing managed P/Invoke caller (`GameCult.Mesh.Quic.Native`'s
+C# side) or Rust caller (`cultmath-core`'s equivalent `#[no_mangle] extern "C"`
+surface) no longer gets what it asked for. Swapping the underlying TLS/QUIC
+implementation (as 1.0.60 did, Schannel to OpenSSL MsQuic) is not breaking
+*by itself* as long as the exported v1 functions keep their signatures and
+behavior — 1.0.60's actual breaking change was the inspector attribute
+removal, not the bridge swap, and its changelog correctly filed the bridge
+swap under "Changed" rather than "Breaking".
+
+## Pre-1.0 packages
+
+A package at `0.y.z` (currently `org.gamecult.cultmath`, at `0.2.x`) uses the
+standard pre-1.0 convention: `MAJOR` stays `0` during initial development, so
+`MINOR` carries what `MAJOR` means once the package reaches `1.0.0`. Concretely:
+
+- a breaking change bumps `MINOR` (and resets `PATCH` to `0`);
+- a non-breaking change bumps `PATCH`.
+
+Leaving `0.y.z` for `1.0.0` is a deliberate, separate decision (the API is now
+considered stable), not something the checker infers on its own.
+
+## What a release changelog entry must contain
+
+Every published package keeps a `CHANGELOG.md` beside its manifest
+(`unity/org.gamecult.cultlib/CHANGELOG.md` and
+`src/GameCult.Unity/Assets/Caching/CHANGELOG.md` are the existing precedent).
+Each release adds a `## [<version>]` section containing:
+
+- a category subsection per change (`### Added`, `### Changed`, `### Fixed`,
+  etc., following Keep a Changelog style);
+- **`### Breaking`** — this exact heading, this exact spelling — for any
+  change that meets the "what counts as breaking" rules above. This heading
+  is not decorative: the CI check below greps for it by name.
+- enough detail that a consumer can tell what to change, in the style of the
+  1.0.60 entry (name the removed/changed symbol and its replacement).
+
+A version with no changelog entry at all fails the check below, the same as
+a mislabelled one — an undocumented release is not a smaller sin than a
+mislabelled one.
+
+## Enforcement
+
+`scripts/check-changelog-semver.mjs` is the mechanical check. Given a
+package name, its `CHANGELOG.md` path, the version being released, and a git
+tag prefix, it:
+
+1. resolves the previous published version from the highest existing
+   `<prefix>-v*` tag older than the version being released (or treats the
+   release as a package's first if none exists);
+2. requires a `## [<version>]` changelog entry to exist at all;
+3. classifies the version bump (major/minor/patch) against the previous
+   version, refusing anything that is not exactly the next version in some
+   lane — a skip, a reversal, or a repeat are all refused, not just wrong
+   bump sizes;
+4. if the changelog entry has a `### Breaking` section, requires the bump to
+   be at least major (or, pre-1.0, at least minor);
+5. fails loudly, naming the package, the previous and new version, and (when
+   relevant) the changelog heading that triggered the requirement.
+
+Run it directly: `node scripts/check-changelog-semver.mjs --package <name>
+--changelog <path> --version <x.y.z> --tag-prefix <prefix>`. Its own tests
+live in `scripts/check-changelog-semver.test.mjs` (`node --test
+scripts/check-changelog-semver.test.mjs`).
+
+It is wired into:
+
+- `.github/workflows/publish-packages.yml`, right after each job's existing
+  "tag matches manifest version" check, for `cultcache-ts`, `cultcache-py`,
+  `cultnet-py`, and `cultmesh-py`;
+- `scripts/build-unity-package.ps1`, for `org.gamecult.cultlib`;
+- `packages/cultmath/scripts/build-unity-package.ps1`, for
+  `org.gamecult.cultmath`;
+- `scripts/verify-caching-unity-release.ps1`, for `org.gamecult.caching.unity`.
+
+### Coverage gaps
+
+`publish-packages.yml` only triggers on `cultcache-ts-v*`, `cultcache-py-v*`,
+`cultnet-py-v*`, and `cultmesh-py-v*` tag pushes — it does not build or gate
+the Unity UPM packages at all; those are consumed directly by git tag
+(`unity/org.gamecult.cultlib`, `packages/cultmath/unity/org.gamecult.cultmath`,
+`src/GameCult.Unity/Assets/Caching`), so a workflow trigger on their tags
+cannot be added to that file without also giving it a reason to check out and
+build Unity content it currently has no job for. The check is instead wired
+into the scripts that already run at Unity-package release time:
+`build-unity-package.ps1` and `packages/cultmath/scripts/build-unity-package.ps1`
+already verify version consistency between the built assembly and
+`package.json`, so the semver check runs alongside that as one more release
+gate. `org.gamecult.caching.unity` has no build script at all today — it is
+pure C# source tagged directly with no compile step — so
+`scripts/verify-caching-unity-release.ps1` exists solely to run this check
+before that package is tagged; it is not a build script and does not become
+one.
+
+None of this is enforced by a git hook or branch protection rule: it runs
+when someone remembers to run the Unity release scripts, the same way the
+existing assembly-version check does. A tag pushed by hand without running
+the release script bypasses both checks equally; closing that gap is a CI
+trigger on tag push for the Unity packages, not something this change adds.
+
+Rust crates (consumed as pinned git revisions, not tagged releases in the
+usual sense) and the CultNet protocol surface itself (no automated wire
+compatibility test currently gates a release) are policy by convention only —
+described above, not mechanically checked. Extending the checker to a Rust
+crate's `Cargo.toml`/`CHANGELOG.md` or to an automated CultNet interop
+compatibility gate is future work, not part of this change.
+
+`@gamecult/cultcache-ts`, `cultcache-py`, `cultnet-py`, `cultmesh-py`, and
+`org.gamecult.cultmath` currently have **no `CHANGELOG.md` file at all**. This
+is a real, pre-existing gap, not something introduced by this policy: their
+next tagged release will fail the new check for exactly that reason ("no
+changelog entry for version X") until each package's `CHANGELOG.md` exists.
+That failure is intended — a release with no changelog is not a smaller
+problem than a mislabelled one — but it does mean the very next release of
+any of these five packages needs a `CHANGELOG.md` created first. Backfilling
+changelog content for their past releases is not part of this change: it
+would mean inventing release-note prose for history this pass has no
+first-hand knowledge of, which is worse than leaving the gap named.

docs/typescript-quic-realtime-target.md

@@ -0,0 +1,160 @@
+# TypeScript QUIC Realtime Plane Target
+
+Date: 2026-09-16
+
+Status: target accepted by the operator (2026-09-16), ready for Eureka. No cut
+map exists yet. When the pipeline starts, Imagination maps the cut into
+`docs/typescript-quic-realtime-cut.md` against `main` at `a0813c6` or later.
+
+The TypeScript runtime gains the CultMesh QUIC realtime state plane that the C#
+runtime already has: a provider that serves frames and a consumer that receives
+them, byte-compatible with `GameCult.Mesh.Quic` and the native MsQuic connector
+the Unity package ships. This document states the end state and the invariants
+that constrain getting there.
+
+Operator ruling, 2026-09-16, on providing QUIC for a Node service: "Option 2 all
+the way, this is what CultLib is supposed to be, we're not half assing it." A
+separate .NET provider process and a WebSocket shortcut were both rejected.
+
+## Why now
+
+The first consumer is StreamPixels. Its service (Node 24, TypeScript, on
+Yggdrasil) must publish realtime state to a Unity overlay running on a
+streamer's machine. The overlay is a receive-only client using the Unity
+package's `CultMeshNativeQuicRealtimeTransportConnector`. Today no TypeScript
+path exists:
+
+- Node v24.15.0 has no `node:quic`, with or without `--experimental-quic`.
+- `packages/cultmesh-ts` and `packages/cultnet-ts` contain no QUIC code.
+- `GameCult.Mesh.Quic` (.NET 10, `System.Net.Quic`) is the only QUIC provider.
+- The C# TCP control and content connectors are plaintext and restricted to
+  loopback (`src/GameCult.Mesh/docs/transport-planes.md`, "Security and release
+  gate"), so they cannot carry the overlay's remote session either.
+
+## This touches the foundation
+
+- **Wire parity is an invariant.** The C# codec is the reference:
+  `src/GameCult.Mesh/CultMeshRealtimeWireProtocol.cs`. The TypeScript runtime
+  must produce and accept identical bytes:
+  - ALPN `cultmesh-state-v1`; connection close code `0x43554c54`, stream abort
+    code `0x53544154`; reliable stream type `1`, latest-only stream type `2`.
+  - Frame: magic `0x31545343`, then a 37-byte little-endian fixed header
+    (delivery byte, producer epoch i64, sequence i64, channel/schema/body id
+    lengths u16, payload length i32, header size i32 = 37, wire version u16 =
+    1), then UTF-8 channel id, schema id, body id, then payload.
+  - Limits: payload at most 64 MiB; each identity at most 65,535 UTF-8 bytes;
+    decode rejects wrong magic, unknown version, out-of-range delivery, and any
+    length that does not sum exactly.
+- **Delivery semantics are an invariant**
+  (`src/GameCult.Mesh.Quic/README.md`, `CultMeshRealtimeTransports.cs`):
+  - `ReliableOrdered`: one persistent ordered stream; broadcast is
+    completion-bearing.
+  - `LatestOnly`: independent streams; at most one pending frame per
+    `(channel, body)`, replaced by a newer `(producer epoch, sequence)`
+    generation; a keyed coalescing outbox per physical peer, so a slow or
+    departed consumer never backpressures the producer.
+  - `Unreliable`: fails closed until datagrams are exposed, matching the managed
+    C# adapter.
+- **Trust is an invariant.** No remote session comes online without the chain
+  in `transport-planes.md`: an Odin-signed `CultMeshRouteCertificate` (Verse,
+  authority runtime, protocol set, endpoint, generation, validity, provider
+  P-256 key) checked against consumer-pinned Odin roots, TLS 1.3, and the
+  endpoint certificate bound to that route, including the
+  `cultmesh-state+quic://host:port?cert-sha256=<uppercase SHA-256>` pin.
+  Signatures are ECDSA P-256 over SHA-256 with P1363 `r || s` encoding and the
+  length-prefixed canonical transcript. Unsigned traffic exists only under an
+  explicit `LocalDevelopment` policy on loopback.
+- **One implementation of TypeScript route verification.** `cultmesh-browser`
+  already verifies Odin route certificates and provider nonce possession with
+  WebCrypto (`packages/cultmesh-browser/src/index.ts`, `verifyAuthorityRoute`,
+  `canonicalRoute`, `canonicalSession`, `verifyP256`). The Node QUIC path must
+  reuse that owner, not grow a second verifier.
+- **The realtime plane carries state frames only.** Schemas, commands,
+  receipts, manifests, and immutable content do not travel through it
+  (`ICultMeshRealtimeTransport` doc comment). RUDP is never installed
+  implicitly in its place.
+- **Existing consumers survive.** The StreamPixels service already imports
+  `cultcache-ts`, `cultnet-ts`, and `cultmesh-ts` (`verse-state.ts`,
+  `idunn-rudp-health.ts`) for Odin advertisement and Idunn health over RUDP.
+  Imagination audits every other TypeScript consumer across `F:\Projects`
+  before sizing the cut.
+
+## Target state
+
+- `cultmesh-ts` exposes a QUIC realtime provider and a QUIC realtime consumer
+  with the same ergonomic shape as the C# `CultMeshQuicRealtimeServer`
+  (listen, broadcast with an explicit delivery mode) and
+  `ICultMeshRealtimeTransportConnector` (connect by advertised candidate,
+  receive frames), under the branded `CultMesh` entrypoint.
+- QUIC comes from native MsQuic bindings owned by CultLib, not from a Node
+  polyfill or a third-party QUIC stack with different semantics. How the binding
+  is built and shipped is the means (Imagination probes it); what it must
+  deliver is TLS 1.3, ALPN, independent unidirectional or bidirectional streams,
+  certificate validation with a caller hook, and clean close and abort codes.
+- Frame encoding and decoding exist once in TypeScript and are tested against
+  bytes produced by the C# codec.
+- Application code never picks endpoints, ranks routes, or writes reconnect
+  loops; `CultMeshSessionManager`-equivalent route selection owns that, as in C#.
+- The build produces binaries for the hosts that run them: Windows x64 for
+  local development, and Linux x64 for Yggdrasil, built on Linux or the deploy
+  path's builder, not cross-compiled on Starfire.
+
+## Not in this migration
+
+One foundation per pipeline. These are separate, named pipelines or consumer
+work:
+
+- **TypeScript content plane** (a provider in `cultmesh-ts`, a verifying HTTPS
+  reader in `cultmesh-browser`) for exported character artifacts. HTTPS content
+  transport and single-host trust on Yggdrasil were already ruled.
+- **Authenticated remote control plane** (TLS on the TCP schema and content
+  connectors). See Q1.
+- **Browser QUIC** (WebTransport). Browsers keep the verified WebSocket path.
+- **Python, Rust, and Kotlin QUIC.** The parity scope is role-scoped; this
+  migration claims TypeScript and C# only.
+- **StreamPixels integration** (service publication, overlay subscription, and
+  the catalog and scene-intent schemas) is consumer work in StreamPixels after a
+  released `cultmesh-ts` exists.
+
+## Verification the cut must reach
+
+- Golden frame bytes from the C# codec decode in TypeScript, and TypeScript
+  encodings decode in C#, for every delivery mode and at the length limits.
+  Malformed inputs are rejected identically.
+- Separate processes, both directions: a TypeScript provider to the C# native
+  connector (the one Unity uses) and to the managed connector, and a C# managed
+  provider to the TypeScript consumer. Extend the existing parity harnesses
+  (`CULTMESH_NATIVE_EXTERNAL_ENDPOINT`, `packages/cultnet-ts/test/interop`) rather
+  than adding a parallel one.
+- `LatestOnly` coalescing: a stalled consumer does not delay the producer, and
+  the consumer converges on the terminal generation.
+- Trust negatives: an expired or unsigned route, the wrong Odin root, a
+  mismatched `cert-sha256` pin, and a replayed nonce are each refused, with a
+  mutation per rule.
+- The Linux x64 binary runs on the Yggdrasil deploy path, verified on that host.
+
+## Rulings (operator, 2026-09-16)
+
+The operator accepted every recommendation below ("You got it"). Each question
+is kept with its options as the record of what was decided against.
+
+- **Q1. Which remote plane carries the overlay's non-frame data?** The realtime
+  plane forbids schemas, commands, and content, and the TCP planes are
+  loopback-only. A: publish her character, the subathon window, and scene
+  intents as QUIC state frames with their CultCache schema id and payload, and
+  ship the costume catalog as a versioned immutable artifact on the HTTPS
+  content plane; the overlay sends no commands, so it needs no remote control
+  plane. B: add TLS to the TCP schema and content connectors as its own
+  pipeline first. **Recommended: A.** It needs no new plane for M1, matches a
+  receive-only client, and leaves TLS TCP to the first consumer that sends
+  commands.
+- **Q2. Where does shared TypeScript route verification live?** It is inside
+  `cultmesh-browser` today, and `cultmesh-ts` is Node-only. A: move it to a
+  browser-safe shared module that both import (for example beside
+  `cultnet-ts/contracts`). B: have `cultmesh-ts` depend on `cultmesh-browser`.
+  **Recommended: A**, so neither transport package owns the other's trust.
+- **Q3. Which platforms must the native binding support at release?**
+  **Recommended: Windows x64 and Linux x64 only**, the two hosts that run it
+  today.
+- **Q4. Are QUIC datagrams (`Unreliable`) in scope?** **Recommended: no.** Fail
+  closed like the managed C# adapter; no consumer needs them.

native/GameCult.Mesh.Quic.Native/CMakeLists.txt

@@ -1,20 +1,118 @@
 cmake_minimum_required(VERSION 3.24)
 project(gamecult_mesh_quic_native LANGUAGES CXX)
 
-if(NOT WIN32)
-  message(FATAL_ERROR "The current CultMesh native QUIC connector supports Windows desktop only")
-endif()
-if(NOT DEFINED MSQUIC_ROOT)
-  message(FATAL_ERROR "MSQUIC_ROOT must point at the extracted Microsoft.Native.Quic.MsQuic.Schannel package build/native directory")
+# Two platforms, one source. Windows takes MsQuic from the pinned OpenSSL NuGet
+# layout (MSQUIC_ROOT); Linux takes it from the extracted libmsquic deb, whose
+# headers and library land in unrelated places, so they are named separately.
+if(NOT WIN32 AND NOT (CMAKE_SYSTEM_NAME STREQUAL "Linux"))
+  message(FATAL_ERROR "The CultMesh native QUIC bridge supports Windows x64 and Linux x64")
 endif()
 
 add_library(gamecult_mesh_quic_native SHARED cultmesh_quic_native.cpp)
 target_compile_features(gamecult_mesh_quic_native PRIVATE cxx_std_20)
-target_compile_definitions(gamecult_mesh_quic_native PRIVATE GAMECULT_MESH_QUIC_NATIVE_EXPORTS WIN32_LEAN_AND_MEAN NOMINMAX)
-target_include_directories(gamecult_mesh_quic_native PRIVATE "${MSQUIC_ROOT}/include")
-target_link_directories(gamecult_mesh_quic_native PRIVATE "${MSQUIC_ROOT}/lib/x64")
-target_link_libraries(gamecult_mesh_quic_native PRIVATE msquic crypt32 bcrypt)
+# include/cultmesh_quic_native.h is the host-facing contract, not an internal
+# detail: the bridge includes it, and so does any consumer that can.
+target_include_directories(gamecult_mesh_quic_native PUBLIC include)
+
+if(WIN32)
+  if(NOT DEFINED MSQUIC_ROOT)
+    message(FATAL_ERROR "MSQUIC_ROOT must point at the extracted Microsoft.Native.Quic.MsQuic.OpenSSL package build/native directory")
+  endif()
+  # Static CRT. A Node or Unity host without the Visual C++ redistributable
+  # installed cannot load a DLL that imports vcruntime140.dll, and the failure
+  # arrives as "the specified module could not be found" with nothing naming the
+  # missing runtime. The bridge carries its own instead.
+  set_property(TARGET gamecult_mesh_quic_native PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded")
+  target_compile_definitions(gamecult_mesh_quic_native PRIVATE WIN32_LEAN_AND_MEAN NOMINMAX)
+  target_include_directories(gamecult_mesh_quic_native PRIVATE "${MSQUIC_ROOT}/include")
+  target_link_directories(gamecult_mesh_quic_native PRIVATE "${MSQUIC_ROOT}/lib/x64")
+  # crypt32 and bcrypt belong to the v1 shim alone: CryptHashCertificate2
+  # compares the Unity pin. Nothing in the v2 path needs them. ntdll carries
+  # RtlIpv4/6StringToAddressEx, which msquic_winuser.h's inline QuicAddrFromString
+  # calls to parse the listener host; the Linux header parses it in-tree instead.
+  target_link_libraries(gamecult_mesh_quic_native PRIVATE msquic crypt32 bcrypt ntdll)
+  # The DLL is committed beside its source, so a rebuild must reproduce it: /Brepro drops the link timestamps.
+  target_compile_options(gamecult_mesh_quic_native PRIVATE /Brepro)
+  target_link_options(gamecult_mesh_quic_native PRIVATE /Brepro)
+else()
+  if(NOT DEFINED MSQUIC_INCLUDE_DIR OR NOT DEFINED MSQUIC_LIB_DIR)
+    message(FATAL_ERROR "MSQUIC_INCLUDE_DIR and MSQUIC_LIB_DIR must point at the msquic v2.5.9 headers and the extracted libmsquic library directory")
+  endif()
+  target_include_directories(gamecult_mesh_quic_native PRIVATE "${MSQUIC_INCLUDE_DIR}")
+  target_link_directories(gamecult_mesh_quic_native PRIVATE "${MSQUIC_LIB_DIR}")
+  target_link_libraries(gamecult_mesh_quic_native PRIVATE msquic pthread)
+  # Only the CULTMESH_API exports leave the .so; everything else stays internal.
+  target_compile_options(gamecult_mesh_quic_native PRIVATE -fvisibility=hidden -fvisibility-inlines-hidden)
+  # libmsquic.so.2 ships beside the bridge rather than being installed
+  # system-wide, so the loader is pointed at the bridge's own directory.
+  set_target_properties(gamecult_mesh_quic_native PROPERTIES
+    BUILD_WITH_INSTALL_RPATH TRUE
+    INSTALL_RPATH "$ORIGIN")
+endif()
 
 set_target_properties(gamecult_mesh_quic_native PROPERTIES
   OUTPUT_NAME "gamecult_mesh_quic_native"
-  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
+  LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+# The runtime-lifetime scenarios. Off by default: the shipped artifact is the
+# library alone, and a delivery build has no business producing an executable.
+# CULTMESH_QUIC_DEBUG_ASSERTS goes with them, never into a shipped binary — it
+# makes the bridge state the quiesce invariant instead of leaving it to whatever
+# a sanitizer happens to catch.
+option(CULTMESH_QUIC_BUILD_TESTS "Build the runtime-lifetime scenario runner" OFF)
+option(CULTMESH_QUIC_DEBUG_ASSERTS "Abort the bridge on a violated internal invariant" OFF)
+
+if(CULTMESH_QUIC_DEBUG_ASSERTS)
+  target_compile_definitions(gamecult_mesh_quic_native PRIVATE CULTMESH_QUIC_DEBUG_ASSERTS)
+endif()
+
+if(CULTMESH_QUIC_BUILD_TESTS)
+  add_executable(cultmesh_quic_native_tests tests/cultmesh_quic_native_tests.cpp)
+  target_compile_features(cultmesh_quic_native_tests PRIVATE cxx_std_20)
+  # The header only. The scenarios drive the bridge as a host does, so they get
+  # no more of it than a host has.
+  target_link_libraries(cultmesh_quic_native_tests PRIVATE gamecult_mesh_quic_native)
+  # The scenarios see the development seam (section 7 of the header) exactly when
+  # the library has one, so `holdclose` compiles out of the same builds the
+  # bridge's own assertions compile out of.
+  if(CULTMESH_QUIC_DEBUG_ASSERTS)
+    target_compile_definitions(cultmesh_quic_native_tests PRIVATE CULTMESH_QUIC_DEBUG_ASSERTS)
+  endif()
+  set_target_properties(cultmesh_quic_native_tests PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+  if(WIN32)
+    # gamecult_mesh_quic_native.dll imports msquic.dll, and the scenario
+    # runner loads it from its own directory (or PATH) at process start, not
+    # from MSQUIC_ROOT. build-quic-native.ps1's packaged output gets a copy
+    # from its own recipe; a test build has no packaging step, so without this
+    # the loader falls through to whatever msquic.dll happens to already be on
+    # PATH — silently running the scenarios against an unpinned, wrong-version
+    # MsQuic instead of failing to start. CMake already knows MSQUIC_ROOT, so
+    # it places the pinned DLL itself instead of leaving the reader to guess
+    # why a scenario passed against the wrong binary.
+    add_custom_command(TARGET cultmesh_quic_native_tests POST_BUILD
+      COMMAND ${CMAKE_COMMAND} -E copy
+        "${MSQUIC_ROOT}/bin/x64/msquic.dll"
+        "$<TARGET_FILE_DIR:cultmesh_quic_native_tests>/msquic.dll")
+  else()
+    target_link_libraries(cultmesh_quic_native_tests PRIVATE pthread)
+    # The linker resolves the bridge's own NEEDED libmsquic.so.2 while linking
+    # this executable, and the runtime copy only lands beside the binaries after
+    # the build; point it at the extracted package instead.
+    target_link_options(cultmesh_quic_native_tests PRIVATE "-Wl,-rpath-link,${MSQUIC_LIB_DIR}")
+    set_target_properties(cultmesh_quic_native_tests PROPERTIES
+      BUILD_WITH_INSTALL_RPATH TRUE
+      INSTALL_RPATH "$ORIGIN")
+    # Both binaries carry INSTALL_RPATH "$ORIGIN" and expect libmsquic.so.2
+    # beside them at load time. build-quic-native.sh's packaged output gets
+    # that copy from its own recipe; a test build has no packaging step, so
+    # the runner would otherwise die at once with "cannot open shared object
+    # file". CMake already knows where MSQUIC_LIB_DIR is, so it places the
+    # file itself instead of leaving the reader to run an extra cp by hand.
+    add_custom_command(TARGET cultmesh_quic_native_tests POST_BUILD
+      COMMAND ${CMAKE_COMMAND} -E copy
+        "${MSQUIC_LIB_DIR}/libmsquic.so.2"
+        "$<TARGET_FILE_DIR:cultmesh_quic_native_tests>/libmsquic.so.2")
+  endif()
+endif()

native/GameCult.Mesh.Quic.Native/README.md

@@ -1,10 +1,168 @@
 # GameCult.Mesh.Quic.Native
 
-This Windows desktop bridge keeps MsQuic's callback-heavy C API below the
-managed runtime boundary. It accepts a discovery-authorized SHA-256 certificate
-pin, negotiates `cultmesh-state-v1`, and emits complete CultMesh realtime frame
-payloads. It owns transport only; frame meaning remains in `GameCult.Mesh`.
+One MsQuic body for every CultMesh host that is not .NET: two roles (provider
+and consumer), two platforms (Windows x64 and Linux x64), and no callbacks
+across the host boundary.
 
-The build consumes Microsoft's pinned
-`Microsoft.Native.Quic.MsQuic.Schannel` package. It does not contain
-Aetheria-specific code.
+The bridge owns MsQuic registration, configuration, listener, connection and
+stream handles, TLS credential loading, the `cultmesh-state-v1` ALPN, the
+1-byte-kind plus 4-byte-LE-length QUIC stream framing, and one event queue per
+runtime. It owns transport and nothing else: it never decodes a CultMesh frame,
+never decides delivery semantics, never coalesces, never reconnects, and in the
+v2 path never decides whether to trust a certificate. Frame meaning stays in
+`GameCult.Mesh` and in the TypeScript codec; trust stays with the host.
+
+## No host callbacks
+
+Every crossing is the host calling in, including the one blocking wait. MsQuic's
+worker threads only ever push onto the queue and wake that wait, so no host
+runtime is called from a thread it does not own. That is what lets one binary
+serve a Node process through FFI and a Unity player through P/Invoke without
+either one's threading rules leaking into the other.
+
+It is also why nothing here includes a Node header, a Unity header, or a
+JavaScript engine: the bridge does not know what is on the other side.
+
+## Two ABIs
+
+**v2** is the runtime-neutral queue API, and the one new hosts should use. It is
+stated once, in [`include/cultmesh_quic_native.h`](include/cultmesh_quic_native.h):
+the 64-byte event struct with its field order and asserted offsets, the thirteen
+exports with their signatures, the id and return-code conventions, the object
+lifetime rules and the threading rules. That file is the contract. This README
+does not restate it, and where the two ever disagree the header is right.
+
+A host that can include it should. A host that cannot — koffi, Unity's
+P/Invoke — declares the same thing in its own FFI and is checked against the
+header by a test rather than by eye.
+
+Two things worth reading before writing a host, because they are easy to get
+wrong from the outside:
+
+- **Return codes are negative on a bad call, on every platform.** `-1` is a bad
+  call, `-2` a rejected argument, `<= -1000` a MsQuic refusal. `QUIC_STATUS`
+  itself is not portable — a negative HRESULT on Windows, a positive errno on
+  POSIX — so it never reaches a host; `cultmesh_quic_last_status` hands over the
+  raw value for diagnostics and nothing else.
+- **`cultmesh_quic_runtime_close` quiesces.** It marks the runtime closing, wakes
+  every blocked `cultmesh_quic_next_event`, and waits for every in-flight call to
+  return before it frees anything. No host call may begin after it starts.
+
+A client connection defers certificate validation: the bridge indicates the
+certificate, emits event 3 carrying the DER, and answers MsQuic only when the
+host calls `cultmesh_quic_connection_certificate_complete`. If the host never
+answers, MsQuic's 10-second handshake timeout closes the connection and event 4
+reports it. Providers load their certificate as PKCS12; the advertised
+`cert-sha256` pin is computed by the host from that same PKCS12, not here.
+
+**v1** is the five exports the shipped Unity package imports by name
+(`cultmesh_quic_open`, `_state`, `_poll`, `_error`, `_close`). They are Windows
+only, matching `CultMeshNativeQuicRealtimeTransport.CanConnect`, and are
+implemented on top of a private v2 runtime holding one connection. They decide
+nothing the v2 path does not, with one exception: a v1 connection carries a
+SHA-256 pin that is compared here, in C, because that is the contract the
+managed connector was built against. A v2 connection never carries one.
+
+## Building
+
+Windows x64, from the repo root:
+
+    powershell -File scripts/build-quic-native.ps1
+
+MsQuic comes from `Microsoft.Native.Quic.MsQuic.OpenSSL` 2.5.9, pinned twice: the
+NuGet zip by digest and size, and the `msquic.dll` inside it by digest and size,
+because the archive is what the download is checked against and the DLL is what
+actually ships beside the bridge. The OpenSSL flavour rather than Schannel
+because Schannel's MsQuic refuses `QUIC_CREDENTIAL_TYPE_CERTIFICATE_PKCS12`,
+which is the only credential type a provider has on both platforms.
+
+The build uses MSVC with `/Brepro` so that a build reproduces itself: the link
+timestamps are dropped, and building the same source twice gives the same bytes.
+It links the CRT statically (`/MT`), because a Node or Unity host without the
+Visual C++ redistributable cannot load a DLL that imports `vcruntime140.dll`,
+and the failure it reports names no missing runtime; the bridge carries its own.
+
+The committed Unity plugin
+(`unity/org.gamecult.cultlib/Runtime/Plugins/x86_64/gamecult_mesh_quic_native.dll`)
+is this build: 302,080 bytes, `/MT`, OpenSSL MsQuic, no CRT import. It replaced
+an older 40,448-byte build — before `/MT` and before the move off Schannel,
+still importing `VCRUNTIME140.dll` and `MSVCP140.dll` — at the CultLib 1.0.60 /
+Studio 1.4.0 release.
+
+Linux x64, on a Debian 13 host:
+
+    scripts/build-quic-native.sh
+
+MsQuic comes from Microsoft's Debian 13 pool as a pinned `.deb`, and the POSIX
+headers from the msquic source tree at the matching tag; all four downloads are
+verified by SHA-256. The bridge is linked with `-fvisibility=hidden` so only the
+v2 exports leave the `.so`, and with `RPATH $ORIGIN` so the `libmsquic.so.2`
+shipped beside it resolves without being installed system-wide.
+
+A Linux host still needs MsQuic's own runtime dependencies present:
+`libssl3t64`, `libnuma1`, `libxdp1`, `libnl-route-3-200`.
+
+The development loop for it is one committed image,
+[`scripts/quic-native-linux-dev.Dockerfile`](../../scripts/quic-native-linux-dev.Dockerfile),
+pinned to the same `debian:13` digest the release workflow builds in. It carries
+the toolchain, MsQuic's runtime dependencies, and `setarch`, because a
+sanitizer build of the runtime-lifetime scenarios needs `personality(ADDR_NO_RANDOMIZE)`
+and a container that cannot ask for that cannot run them:
+
+    docker build -t cultlib-quic-native-dev -f scripts/quic-native-linux-dev.Dockerfile scripts
+    docker run --rm --security-opt seccomp=unconfined -v "${PWD}:/src" -w /src cultlib-quic-native-dev bash -lc "
+      scripts/build-quic-native.sh
+      cmake -S native/GameCult.Mesh.Quic.Native -B artifacts/quic-native-tests/linux-x64 -G Ninja \
+        -DCMAKE_BUILD_TYPE=Release -DCULTMESH_QUIC_BUILD_TESTS=ON -DCULTMESH_QUIC_DEBUG_ASSERTS=ON \
+        -DMSQUIC_INCLUDE_DIR=\$(pwd)/artifacts/dependencies/msquic-linux-2.5.9/include \
+        -DMSQUIC_LIB_DIR=\$(pwd)/artifacts/dependencies/msquic-linux-2.5.9/package/usr/lib/x86_64-linux-gnu
+      cmake --build artifacts/quic-native-tests/linux-x64
+      for scenario in closerace holdclose holdtimeout polltimeout pollbusy pollhammer zerotimeout payloadfit latecall waitseam; do
+        setarch -R artifacts/quic-native-tests/linux-x64/bin/cultmesh_quic_native_tests \"\${scenario}\" || exit 1
+      done
+    "
+
+Both lines are run from the repository root, and the mount is that root wherever
+it is: `${PWD}` in PowerShell, `$(pwd)` in a POSIX shell. `MSQUIC_INCLUDE_DIR`
+and `MSQUIC_LIB_DIR` need `$(pwd)` too, even though the `cmake` invocation
+itself already runs from `/src`: CMake resolves a relative path passed as a
+cache variable against the CMakeLists.txt that consumes it
+(`native/GameCult.Mesh.Quic.Native`), not against the directory `cmake` was
+invoked from, so a bare `artifacts/...` here looks for the dependency one level
+too deep and fails the compile before it reaches the loader. The test target's
+own build now copies `libmsquic.so.2` from `MSQUIC_LIB_DIR` beside the built
+binaries, so nothing else here needs the packaged output directory `scripts/build-quic-native.sh`
+produces. `CULTMESH_QUIC_BUILD_TESTS`
+is off in the shipped configuration (see the CMakeLists.txt option comment); it
+turns on the scenario runner `tests/cultmesh_quic_native_tests.cpp` compiles into,
+and `CULTMESH_QUIC_DEBUG_ASSERTS` turns on both the bridge's internal invariant
+assertions and the four scenarios (`holdclose`, `latecall`, `holdtimeout`,
+`waitseam`) that need the development seam in section 7 of the header. Each
+scenario name is a positional argument to the built binary; run them individually
+to bisect a failure, or all ten as shown to cover the runtime-lifetime rules.
+
+A Windows clone made before `.gitattributes` kept shell scripts at LF still has
+`scripts/build-quic-native.sh` with carriage returns, and pulling does not fix
+it: the script's content did not change, so git neither rewrites it nor reports
+it modified. The container then dies at once on the interpreter `bash\r`. From
+the repository root, in either shell, this checks the script out again under the
+current attributes:
+
+    git rm --cached -q scripts/build-quic-native.sh; git checkout HEAD -- scripts/build-quic-native.sh
+
+`--security-opt seccomp=unconfined` is load-bearing, not caution. A
+ThreadSanitizer configuration needs the process's address space where it expects
+it, so a TSan run must be re-executed under `setarch -R`, which asks the kernel
+for `personality(ADDR_NO_RANDOMIZE)`. Docker's default seccomp profile denies
+that call. Without it ThreadSanitizer dies before `main` with "unexpected memory
+mapping" — a configuration that never starts, not a scenario that passed.
+
+A win32-x64 build of the scenario runner needs the checkout somewhere short —
+near a drive root rather than under a deep temporary directory. MSVC builds the
+bridge and its scenario runner through MSBuild, whose file tracker gives out on
+long paths, and the build then fails outright rather than naming the path as the
+cause.
+
+Where an artifact was built is part of what it is. The Linux binary is linked
+against Debian 13's glibc, so a build from anywhere else is a different artifact
+whatever the file name says.

native/GameCult.Mesh.Quic.Native/include/cultmesh_quic_native.h

@@ -0,0 +1,371 @@
+/* GameCult.Mesh.Quic.Native — C ABI v2, the runtime-neutral CultMesh QUIC bridge.
+ *
+ * This header is the contract. It is the single place the event layout, the
+ * exports, the id and return-code conventions, the object lifetime rules and the
+ * threading rules are stated; `cultmesh_quic_native.cpp` includes it, the README
+ * points at it, and a host that cannot include it (koffi, P/Invoke) declares the
+ * same thing in its own FFI and is checked against this file by a test.
+ *
+ * It is C. It includes nothing of MsQuic, nothing of Node, nothing of Unity, and
+ * nothing platform-specific: a host binds these twelve queue exports plus
+ * `cultmesh_quic_last_status` and needs no other build input.
+ *
+ * The v1 Unity exports (`cultmesh_quic_open`, `_state`, `_poll`, `_error`,
+ * `_close`) are deliberately not here. They are a Windows-only shim for a
+ * shipped managed connector, not a contract offered to new hosts.
+ */
+
+#ifndef CULTMESH_QUIC_NATIVE_H
+#define CULTMESH_QUIC_NATIVE_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#if defined(__cplusplus)
+#define CULTMESH_QUIC_STATIC_ASSERT(condition, message) static_assert(condition, message)
+#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#define CULTMESH_QUIC_STATIC_ASSERT(condition, message) _Static_assert(condition, message)
+#else
+#define CULTMESH_QUIC_STATIC_ASSERT(condition, message)
+#endif
+
+/* `CULTMESH_QUIC_BUILD` is defined by the bridge's own translation unit and by
+ * nothing else. A consumer gets plain declarations and links by name, which is
+ * what every host here does: all three load the library at runtime. */
+#if defined(CULTMESH_QUIC_BUILD)
+#  if defined(_WIN32)
+#    define CULTMESH_QUIC_API __declspec(dllexport)
+#  else
+#    define CULTMESH_QUIC_API __attribute__((visibility("default")))
+#  endif
+#else
+#  define CULTMESH_QUIC_API
+#endif
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/* ---------------------------------------------------------------------------
+ * 1. The event
+ *
+ * Exactly 64 bytes, no implicit padding, field order below is the ABI. A host
+ * that reorders a field reads a different struct; the offsets are asserted here
+ * so a compiler that pads differently fails the build rather than the wire.
+ * --------------------------------------------------------------------------- */
+
+struct cultmesh_quic_event {
+    uint32_t type;           /* offset  0 — one of the cultmesh_quic_event_type values */
+    uint32_t stream_kind;    /* offset  4 — 1 reliable, 2 latest-only; 0 when not a stream event */
+    uint64_t listener_id;    /* offset  8 — 0 for an outbound connection */
+    uint64_t connection_id;  /* offset 16 */
+    uint64_t stream_id;      /* offset 24 */
+    uint64_t code;           /* offset 32 — meaning depends on `type`; see below */
+    int32_t  status;         /* offset 40 — the raw platform QUIC status, diagnostics only */
+    int32_t  payload_length; /* offset 44 — bytes written into the caller's payload buffer */
+    uint8_t  reserved[16];   /* offset 48 — zero today; do not read meaning into it */
+};
+
+CULTMESH_QUIC_STATIC_ASSERT(sizeof(struct cultmesh_quic_event) == 64,
+    "the event struct is a 64-byte ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, type) == 0,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, stream_kind) == 4,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, listener_id) == 8,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, connection_id) == 16,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, stream_id) == 24,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, code) == 32,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, status) == 40,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, payload_length) == 44,
+    "event field offsets are an ABI contract");
+CULTMESH_QUIC_STATIC_ASSERT(offsetof(struct cultmesh_quic_event, reserved) == 48,
+    "event field offsets are an ABI contract");
+
+enum cultmesh_quic_event_type {
+    /* A listener accepted an inbound connection. `listener_id`, `connection_id`. */
+    CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION = 1,
+    /* The handshake completed. `connection_id`. */
+    CULTMESH_QUIC_EVENT_CONNECTION_CONNECTED = 2,
+    /* Payload: the peer's DER certificate. The handshake is blocked until the
+     * host answers with `cultmesh_quic_connection_certificate_complete`. */
+    CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED = 3,
+    /* The connection is gone, whoever ended it, and its id no longer resolves.
+     * Payload: a UTF-8 reason. `code` is the QUIC application error code — the
+     * peer's when the peer ended it, and the code the host passed to
+     * `cultmesh_quic_connection_shutdown` when the host did. Emitted exactly
+     * once per connection id, including for the initiator of a local shutdown:
+     * every connection id's end is observable from the host that owns it. */
+    CULTMESH_QUIC_EVENT_CONNECTION_SHUTDOWN = 4,
+    /* An inbound stream's first byte named its kind. `stream_id`, `stream_kind`. */
+    CULTMESH_QUIC_EVENT_STREAM_STARTED = 5,
+    /* Payload: one whole encoded frame, the 4-byte length prefix stripped. */
+    CULTMESH_QUIC_EVENT_STREAM_FRAME = 6,
+    /* One per `cultmesh_quic_stream_send_frame` call that returned 0, and never
+     * for the bridge's own kind byte. `code` is a cultmesh_quic_send_result. */
+    CULTMESH_QUIC_EVENT_STREAM_SEND_COMPLETE = 7,
+    /* The stream is gone. `stream_id`, `stream_kind`. */
+    CULTMESH_QUIC_EVENT_STREAM_SHUTDOWN = 8,
+    /* The listener stopped. `listener_id`. */
+    CULTMESH_QUIC_EVENT_LISTENER_STOPPED = 9
+};
+
+/* The `code` of event 7. A canceled send is a send MsQuic released without
+ * putting on the wire — the stream was aborted or the connection ended under it.
+ * It is reported, not silently dropped. */
+enum cultmesh_quic_send_result {
+    CULTMESH_QUIC_SEND_COMPLETED = 0,
+    CULTMESH_QUIC_SEND_CANCELED = 1
+};
+
+/* The first byte of every CultMesh QUIC stream. */
+enum cultmesh_quic_stream_kind {
+    CULTMESH_QUIC_STREAM_RELIABLE = 1,
+    CULTMESH_QUIC_STREAM_LATEST_ONLY = 2
+};
+
+/* ---------------------------------------------------------------------------
+ * 2. Ids
+ *
+ * Listeners, connections and streams are named by `uint64_t` ids drawn from one
+ * per-runtime counter that starts at 1 and never repeats. 0 is never a valid id
+ * and is what an out parameter holds when a call fails. An id is the only thing
+ * a host ever holds: there is no host-visible pointer to a connection or stream,
+ * so a host cannot outlive an object it is naming. An id whose object is gone is
+ * a bad call (-1), not undefined behaviour.
+ * --------------------------------------------------------------------------- */
+
+/* ---------------------------------------------------------------------------
+ * 3. Return codes — negative on a bad call, on every platform
+ *
+ * Every int32_t-returning export returns:
+ *
+ *    0                        the call succeeded
+ *    1, 2                     `cultmesh_quic_next_event` only; see its comment
+ *   -1                        a bad call: a null handle, a null out parameter,
+ *                             or an id whose object is gone
+ *   -2                        an argument the bridge rejects on its own terms:
+ *                             an unknown stream kind, an oversized frame, a
+ *                             listener host that is not an IP literal
+ *   <= -1000                  MsQuic refused. The bridge code is
+ *                             -(1000 + (raw_status & 0xffff)); the raw
+ *                             platform status is available from
+ *                             `cultmesh_quic_last_status` and a sentence about
+ *                             it from `cultmesh_quic_last_error`.
+ *
+ * This mapping exists because `QUIC_STATUS` itself is not portable: it is a
+ * negative HRESULT on Windows and a positive errno on POSIX, so a host that
+ * checked for a negative value saw every Linux failure as success.
+ *
+ * What the mapping makes portable is the sign, and only the sign. A failure is
+ * negative everywhere, and that is what a host may branch on. The magnitude of a
+ * <= -1000 code is diagnostic and platform-specific: the same MsQuic failure
+ * carries different numbers on different platforms (a TLS error is -12032 on
+ * win32-x64 and -1126 on linux-x64; an ALPN already in use is -1009 against
+ * -1091), and the 16-bit mask can give two distinct statuses the same code
+ * (`QUIC_STATUS_USER_CANCELED` and `QUIC_STATUS_FILE_NOT_FOUND` are both -1002
+ * on Windows). Switching on a particular code is therefore not portable and not
+ * a reliable identification of the failure. Report it, log it, and read
+ * `cultmesh_quic_last_status` and `cultmesh_quic_last_error` beside it.
+ * --------------------------------------------------------------------------- */
+
+#define CULTMESH_QUIC_RESULT_BAD_CALL (-1)
+#define CULTMESH_QUIC_RESULT_BAD_ARGUMENT (-2)
+#define CULTMESH_QUIC_RESULT_MSQUIC_BASE (-1000)
+
+/* ---------------------------------------------------------------------------
+ * 4. Object lifetime — resolved from an id, kept alive across the call
+ *
+ * The bridge's objects are shared-owned. The runtime's maps hold one reference
+ * each; an export that names an id takes its own reference under the lock and
+ * holds it for the whole MsQuic call, so an object cannot be freed under a host
+ * thread that is using it. MsQuic's worker, on shutdown-complete, removes the
+ * map entry and drops the map's reference only — it never frees an object a host
+ * call is inside.
+ *
+ * The MsQuic handle follows the object: it is closed exactly once, by whichever
+ * holder drops the last reference (or by `cultmesh_quic_runtime_close`), under a
+ * one-shot exchange guard. A handle is therefore valid for as long as any holder
+ * has a reference to its object, which is the property the host thread needs. A
+ * stream holds a reference to its connection, so stream handles are always
+ * closed before the connection handle they belong to.
+ *
+ * `cultmesh_quic_runtime_close` quiesces before it tears anything down. It marks
+ * the runtime closing, wakes every blocked `cultmesh_quic_next_event`, and waits
+ * for every in-flight export to return before it closes a handle or frees a
+ * byte. No host call may begin after `cultmesh_quic_runtime_close` starts. That
+ * ordering is the host's, and it is a prohibition rather than a race the bridge
+ * arbitrates: once the close returns, the handle names freed memory, and a call
+ * made with it has nothing left to refuse it. A call that races the start of the
+ * close, while it is still running, is refused with -1 and touches nothing; that
+ * narrows one mis-ordering and does not make the prohibition optional.
+ * --------------------------------------------------------------------------- */
+
+/* ---------------------------------------------------------------------------
+ * 5. Threading
+ *
+ * There are no host callbacks. Every crossing is the host calling in.
+ *
+ *  - MsQuic's worker threads run inside this library only. They push events onto
+ *    the runtime's queue and wake the one blocking wait. No host code is ever
+ *    called from a thread the host does not own.
+ *  - `cultmesh_quic_next_event` is called from host threads, one or many. It is
+ *    the only blocking export. Concurrent callers each get a distinct event.
+ *  - Every other export may be called from any host thread at any time, except
+ *    during or after `cultmesh_quic_runtime_close`.
+ *  - `cultmesh_quic_runtime_close` is called once, from one thread, and
+ *    quiesces as described above.
+ * --------------------------------------------------------------------------- */
+
+/* ---------------------------------------------------------------------------
+ * 6. The exports
+ * --------------------------------------------------------------------------- */
+
+/* Opens a runtime: one MsQuic registration, one event queue. `app_name` may be
+ * null. `*out_runtime` is the opaque handle every other export takes. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_runtime_open(
+    const char* app_name, void** out_runtime);
+
+/* Quiesces, tears down and frees the runtime. Safe to call with null. After it
+ * returns, the handle is dead; see section 4 for the ordering rule. */
+CULTMESH_QUIC_API void cultmesh_quic_runtime_close(void* runtime);
+
+/* Opens a provider listener on `host`:`port` with a PKCS12 credential. `host`
+ * may be null or empty for any address, otherwise it must be an IP literal.
+ * `port` 0 binds an ephemeral port, which `*out_bound_port` reports. A failure
+ * leaves no listener behind and no id allocated to the host. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_listener_open(
+    void* runtime, const char* host, uint16_t port,
+    const uint8_t* pkcs12, int32_t pkcs12_length, const char* password,
+    uint64_t* out_listener_id, uint16_t* out_bound_port);
+
+/* Stops and closes a listener. Its accepted connections are not affected.
+ * Emits event 9. Unknown ids are ignored. */
+CULTMESH_QUIC_API void cultmesh_quic_listener_close(
+    void* runtime, uint64_t listener_id);
+
+/* Starts an outbound connection. Certificate validation is deferred: the host
+ * gets event 3 and must answer. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_connection_open(
+    void* runtime, const char* host, uint16_t port, uint64_t* out_connection_id);
+
+/* Answers event 3. `accept` non-zero continues the handshake; zero fails it with
+ * a bad-certificate alert. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_connection_certificate_complete(
+    void* runtime, uint64_t connection_id, int32_t accept);
+
+/* Ends a connection with a QUIC application error code. The initiator gets its
+ * own event 4 carrying `code`, as the peer does. Unknown ids are ignored. */
+CULTMESH_QUIC_API void cultmesh_quic_connection_shutdown(
+    void* runtime, uint64_t connection_id, uint64_t code);
+
+/* Opens an outbound unidirectional stream and puts `kind` on the wire as its
+ * first byte. That byte is the bridge's own and never produces an event 7. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_stream_open(
+    void* runtime, uint64_t connection_id, uint8_t kind, uint64_t* out_stream_id);
+
+/* Queues one whole encoded frame, length-prefixed by the bridge. A call that
+ * returns 0 produces exactly one event 7 later, completed or canceled. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_stream_send_frame(
+    void* runtime, uint64_t stream_id,
+    const uint8_t* encoded_frame, int32_t length, int32_t fin);
+
+/* Aborts a stream with a QUIC application error code. Unknown ids are ignored. */
+CULTMESH_QUIC_API void cultmesh_quic_stream_shutdown(
+    void* runtime, uint64_t stream_id, uint64_t code);
+
+/* The one blocking crossing.
+ *
+ *   0   nothing within `timeout_ms`. A poller already blocked here when
+ *       `cultmesh_quic_runtime_close` starts is woken and returns 0. A poll that
+ *       begins after the close starts is forbidden by section 4, and is not a
+ *       case this return code covers.
+ *   1   `*out_event` filled and up to `payload_capacity` payload bytes copied;
+ *       `*out_required` is the payload size
+ *   2   `payload_capacity` is too small. Nothing is consumed and nothing is
+ *       written to `*out_event`; `*out_required` is the size to allocate. Ask
+ *       again with a big enough buffer and the same event is delivered.
+ *  -1   a bad call, including a null `payload` with a non-zero
+ *       `payload_capacity`, which is a lie about the buffer and is refused
+ *       rather than treated as a discard.
+ *
+ * `payload` may be null when `payload_capacity` is 0: that is the two-phase
+ * poll's first ask. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_next_event(
+    void* runtime, int32_t timeout_ms, struct cultmesh_quic_event* out_event,
+    uint8_t* payload, int32_t payload_capacity, int32_t* out_required);
+
+/* The last error sentence, NUL-terminated, truncated to `capacity`. Returns the
+ * number of bytes written, or -1 on a bad call. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_last_error(
+    void* runtime, char* destination, int32_t capacity);
+
+/* The raw platform `QUIC_STATUS` behind the last <= -1000 return, as its own
+ * bits: a negative HRESULT on Windows, a positive errno on POSIX. Diagnostics
+ * only; what is portable about the return code is its sign, not its value. 0
+ * when nothing has failed. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_last_status(void* runtime);
+
+/* ---------------------------------------------------------------------------
+ * 7. The development seam
+ *
+ * Present only in a library configured with `CULTMESH_QUIC_DEBUG_ASSERTS`, which
+ * a shipped build never is. It exists for the runtime-lifetime scenarios: the
+ * quiesce is a promise about host calls that are inside the library, and the
+ * wait scenarios need the same kind of promise about the exact duration the
+ * bridge hands its own condition wait. A scenario that can only sleep and hope
+ * cannot tell a bridge that counts and waits correctly from one that does not.
+ *
+ * It is process-wide, not per-runtime, because the numbers outlive the runtime
+ * they describe: `cultmesh_quic_runtime_close` frees the runtime, and the count
+ * it waited on is read afterwards. The scenarios open one runtime at a time.
+ * --------------------------------------------------------------------------- */
+#if defined(CULTMESH_QUIC_DEBUG_ASSERTS)
+
+/* Non-zero arms the hold and resets both counters: every call that reaches the
+ * blocking wait in `cultmesh_quic_next_event` parks inside the library instead
+ * of returning. Zero releases every held call and disarms it. A held call
+ * returns 0 and touches the runtime no further. */
+CULTMESH_QUIC_API void cultmesh_quic_debug_hold_calls(int32_t hold);
+
+/* The high-water mark of host calls counted inside the library since the hold
+ * was armed. Zero means no call was ever counted. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_debug_peak_calls(void);
+
+/* How many host calls were counted inside the library when the last
+ * `cultmesh_quic_runtime_close` began its wait, or -1 if no close has begun one
+ * since the hold was armed. This is the number the wait exists for. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_debug_calls_at_close(void);
+
+/* The whole duration, in milliseconds, most recently handed to the condition
+ * wait inside `cultmesh_quic_next_event`, recorded at the point the wait is
+ * entered rather than observed from outside. A poll whose queue is not empty,
+ * or whose `timeout_ms` is not greater than zero, never enters that wait and
+ * leaves this unchanged. -1 until the first such wait, or after
+ * `cultmesh_quic_debug_reset_last_wait_ms` — tracked by a separate internal
+ * flag, not by -1 being stored here, so a wait that ever recorded exactly -1
+ * itself could not be confused with nothing having been recorded.
+ *
+ * This exists because a wall-clock probe cannot tell the host's timeout from
+ * any function of it that is the identity at the probe's own value — a floor,
+ * a round, a clamp, a later-poll fault, there is always another one that
+ * matches. This reads what the bridge actually handed its wait instead of
+ * inferring it from how long a call took. */
+CULTMESH_QUIC_API int32_t cultmesh_quic_debug_last_wait_ms(void);
+
+/* Resets the value `cultmesh_quic_debug_last_wait_ms` reports to -1, without
+ * touching the hold or the two call counters above. */
+CULTMESH_QUIC_API void cultmesh_quic_debug_reset_last_wait_ms(void);
+
+#endif /* CULTMESH_QUIC_DEBUG_ASSERTS */
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* CULTMESH_QUIC_NATIVE_H */

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+      }
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+      }
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+        "arm64"
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+      "optional": true,
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+        "openbsd"
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+      "funding": {
+        "url": "https://liberapay.com/Koromix"
+      }
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+      "resolved": "https://registry.npmjs.org/@koromix/koffi-openbsd-ia32/-/koffi-openbsd-ia32-3.3.0.tgz",
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+        "ia32"
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+        "url": "https://liberapay.com/Koromix"
+      }
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+    "node_modules/@koromix/koffi-openbsd-x64": {
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+      "resolved": "https://registry.npmjs.org/@koromix/koffi-openbsd-x64/-/koffi-openbsd-x64-3.3.0.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "funding": {
+        "url": "https://liberapay.com/Koromix"
+      }
+    },
+    "node_modules/@koromix/koffi-win32-arm64": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@koromix/koffi-win32-arm64/-/koffi-win32-arm64-3.3.0.tgz",
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+      "cpu": [
+        "arm64"
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+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "funding": {
+        "url": "https://liberapay.com/Koromix"
+      }
+    },
+    "node_modules/@koromix/koffi-win32-ia32": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@koromix/koffi-win32-ia32/-/koffi-win32-ia32-3.3.0.tgz",
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+      "cpu": [
+        "ia32"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "funding": {
+        "url": "https://liberapay.com/Koromix"
+      }
+    },
+    "node_modules/@koromix/koffi-win32-x64": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@koromix/koffi-win32-x64/-/koffi-win32-x64-3.3.0.tgz",
+      "integrity": "sha512-D+ORp73rTmvGVfq01+4uBmgVZqrPqU9N9xCZCfexaCDlVk0WQsaqid1dGsi6eScJuHt4Cp8s1i5/4CsecxFTKQ==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "funding": {
+        "url": "https://liberapay.com/Koromix"
+      }
+    },
     "node_modules/@msgpack/msgpack": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/@msgpack/msgpack/-/msgpack-3.1.3.tgz",
@@ -715,6 +1035,38 @@
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       "license": "MIT"
     },
+    "node_modules/koffi": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/koffi/-/koffi-3.3.0.tgz",
+      "integrity": "sha512-UeyQtptuPeCP0BqKD+Q8ftTQhIUBHO7bXyK9DVIaW9hJSg0BrICm4K5N8Qtn7zKk20sb5vpnES9KBqVksM2kpQ==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://liberapay.com/Koromix"
+      },
+      "optionalDependencies": {
+        "@koromix/koffi-android-arm64": "3.3.0",
+        "@koromix/koffi-android-x64": "3.3.0",
+        "@koromix/koffi-darwin-arm64": "3.3.0",
+        "@koromix/koffi-darwin-x64": "3.3.0",
+        "@koromix/koffi-freebsd-arm64": "3.3.0",
+        "@koromix/koffi-freebsd-ia32": "3.3.0",
+        "@koromix/koffi-freebsd-x64": "3.3.0",
+        "@koromix/koffi-linux-arm": "3.3.0",
+        "@koromix/koffi-linux-arm64": "3.3.0",
+        "@koromix/koffi-linux-ia32": "3.3.0",
+        "@koromix/koffi-linux-loong64": "3.3.0",
+        "@koromix/koffi-linux-ppc64": "3.3.0",
+        "@koromix/koffi-linux-riscv64": "3.3.0",
+        "@koromix/koffi-linux-x64": "3.3.0",
+        "@koromix/koffi-openbsd-arm64": "3.3.0",
+        "@koromix/koffi-openbsd-ia32": "3.3.0",
+        "@koromix/koffi-openbsd-x64": "3.3.0",
+        "@koromix/koffi-win32-arm64": "3.3.0",
+        "@koromix/koffi-win32-ia32": "3.3.0",
+        "@koromix/koffi-win32-x64": "3.3.0"
+      }
+    },
     "node_modules/lodash": {
       "version": "4.18.1",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
@@ -867,7 +1219,8 @@
       "dependencies": {
         "@gamecult/cultcache-ts": "^0.14.0",
         "@msgpack/msgpack": "^3.1.2",
-        "cultnet-ts": "^0.2.0"
+        "cultnet-ts": "^0.2.0",
+        "koffi": "3.3.0"
       },
       "devDependencies": {
         "@types/node": "^24.0.0",

packages/cultmath/README.md

@@ -26,13 +26,13 @@ shader semantics.
   acceleration and semi-implicit Euler integration
 - `math` intrinsics: `radians`, `degrees`, `abs`, `floor`, `ceil`, `frac`,
   `min`, `max`, `clamp`, `saturate`, `lerp`, `step`, `smoothstep`, `dot`,
-  `cross`, `length`, `distance`, `normalize`, `reflect`, `csum`, exponential
+  `cross`, `length`, `distance`, `normalize`, `reflect`, `csum`, `erf`,
+  `erfinv` (scalar only), exponential
   `decay`/`damp`, intercept/segment helpers, Catmull-Rom, Bezier curves, and
   deterministic value-noise primitives
 - `shaders/CultMath.hlsl`, a canonical HLSL mirror include for shader-side
   parity. HLSL already owns `float2`, `float3`, and `float4`; the include
-  exposes `cultmath_*` functions for shared semantics, including CultMath's
-  safe `normalize` contract.
+  exposes `cultmath_*` functions for shared semantics HLSL does not provide.
 - `Voronoi.SampleTones`, a C# batch surface that calls the Rust
   `cultmath-core` native kernel when `cultmath_core` is available and falls back
   to the managed parity path otherwise.
@@ -59,7 +59,7 @@ float grain = math.value_noise_bicubic(math.float2(12.0f, 3.5f));
 ```hlsl
 #include "CultMath.hlsl"
 
-float3 normal = cultmath_normalize(float3(0.25, 1.0, -0.1));
+float3 normal = normalize(float3(0.25, 1.0, -0.1));
 float rim = cultmath_saturate(1.0 - dot(normal, float3(0.0, 0.0, -1.0)));
 float glow = cultmath_smoothstep(0.2, 1.0, rim);
 float grain = cultmath_value_noise_bicubic(float2(12.0, 3.5));

packages/cultmath/docs/design.md

@@ -52,7 +52,26 @@ That makes these HLSL rules, not options:
   operand returns the other (so `saturate(NaN)` is 0), `clamp(x, a, b)` is
   `min(max(x, a), b)`, and `saturate(x)` is `min(1, max(0, x))`, which maps -0
   to +0; `any`/`all` accept numeric vectors (a component is true when it is
-  not 0); `min`, `max`, and `abs` on int vectors return int vectors.
+  not 0); `min`, `max`, and `abs` on int vectors return int vectors; int
+  `clamp` is `IMin(IMax(x, a), b)`, so inverted bounds return `b`.
+- Same-size vector conversions (`intN(floatN)`, `floatN(intN)`, `boolN(floatN)`,
+  `boolN(intN)`, `floatN(boolN)`, `intN(boolN)`) exist as constructors and
+  `math` functions and follow dxc: float to int is `fptosi`, truncating toward
+  zero; numeric to bool is `!= 0` (`fcmp une`, so NaN is true); bool to numeric
+  is 0 or 1. DXIL leaves float-to-int undefined for NaN and out-of-range values,
+  and so does C#; CultMath does not pin them.
+- `normalize(x)` is `x * Rsqrt(Dot(x, x))`, which is how dxc lowers it, and
+  DXIL.rst defines `Rsqrt` as `1 / sqrt(src)`. A zero vector therefore
+  normalizes to NaN (`0 * inf`), and a NaN component makes every component NaN.
+  (The special-value table under `Rsqrt` in DXIL.rst is a copy of the `Round`
+  table and contradicts that definition, so CultMath follows the definition.)
+  `length` and `distance` are `Sqrt` of the summed squares, so a zero vector
+  gives 0. Callers that can meet zero-length vectors guard them before calling
+  `normalize`.
+- dxc demotes double `frac`, `exp`, `lerp`, and `floor` to float. CultMath's
+  double overloads keep double precision instead: `frac(double)` is
+  `x - floor(x)` in double. That is a deliberate divergence for CPU simulation
+  time, which shaders do not carry.
 
 dxc marks float arithmetic and compares `fast` (no NaNs) unless a value is
 `precise`, so drivers may optimize NaN handling away and NaN results on real
@@ -64,9 +83,7 @@ GPU. Because `min`, `max`, and `saturate` return the non-NaN operand, some
 functions turn NaN or infinity into numbers: `smoothstep(a, a, a)` is 0;
 infinite inputs to `smoothstep` and the intercept helpers give numbers; the
 bezier, `smoothstep01`, and `smootherstep` functions return finite values for
-NaN input; and `normalize((NaN, 2.41))` is `(NaN, 2.41e20)`, because the NaN
-length is clamped to the epsilon and the other component is divided by it.
-Callers that must detect bad data should check `isnan` before calling these
+NaN input. Callers that must detect bad data should check `isnan` before calling these
 functions.
 
 Deferred until a consumer needs them: `float4x4`, `transpose`, `determinant`,
@@ -103,9 +120,20 @@ compiled under `using static CultMath.math;`, so its intrinsics are C# `math`
 itself: the test proves the composition in the text, not the intrinsic rules,
 which only `HlslSemanticsTests` pins.
 
+Integer hashing uses the PCG hashes from Jarzynski and Olano, "Hash Functions
+for GPU Rendering" (JCGT 9(3), 2020): `pcg(uint)` is O'Neill's RXS-M-XS 32/32
+permutation over one LCG step, and `pcg3d`/`pcg4d` are the paper's (3 → 3) and
+(4 → 4) hashes. They use only uint multiply, add, xor, and shifts. dxc wraps
+uint multiply and add modulo 2^32 exactly as C# unchecked arithmetic does, so
+they are integer-exact in HLSL and on the CPU, GPU included, unlike the
+`sin`-based `hash`. CultMath has no uint vectors, so `pcg3d(int3)` and
+`pcg4d(int4)` carry uint bit patterns in int components. The `float2`/`float3`/`float4`
+overloads hash the IEEE-754 bits (`asuint`), so -0 and 0 hash differently.
+`pcg3d(float2)` holds z at 0, which is the paper's route for (2 → N) inputs.
+Seeds and other scalar uses take one output component.
+
 Where HLSL is silent, CultMath keeps its own decisions and does not defer to
-Unity.Mathematics: `normalize` is safe (divides by `max(length, 1e-20)`),
-`hash` returns float, and `Random` is CultMath's own xorshift32. Engine-shaped
+Unity.Mathematics: `hash` returns float, and `Random` is CultMath's own xorshift32. Engine-shaped
 helpers that HLSL lacks (`float2x2.Rotate`, `float3x3.Euler`, `quaternion`,
 `snoise`) enter only when a consumer needs them, with their semantics stated in
 code.

packages/cultmath/scripts/build-unity-package.ps1

@@ -27,6 +27,25 @@ if (Test-Path -LiteralPath $outputRoot) {
   Remove-Item -LiteralPath $outputRoot -Recurse -Force
 }
 
+# docs/semver-policy.md (CultLib root, two levels up from this script):
+# refuse to build a release whose CHANGELOG.md entry claims a breaking change
+# under too small a bump, or whose version skips or reverses the previous
+# published tag. Runs before the build below so a bad version number fails
+# fast. cultmath is pre-1.0 (0.y.z): a breaking change must be at least a
+# minor bump. $repoRoot above is this package's own root (packages\cultmath),
+# not CultLib's; the shared checker script lives one level above that.
+$cultLibRoot = Split-Path -Parent (Split-Path -Parent $repoRoot)
+$cultmathVersion = (Get-Content -LiteralPath (Join-Path $templateRoot "package.json") -Raw | ConvertFrom-Json).version
+& node (Join-Path $cultLibRoot "scripts\check-changelog-semver.mjs") `
+  --package "org.gamecult.cultmath" `
+  --changelog (Join-Path $templateRoot "CHANGELOG.md") `
+  --version $cultmathVersion `
+  --tag-prefix "cultmath-unity" `
+  --cwd $cultLibRoot
+if ($LASTEXITCODE -ne 0) {
+  throw "CultMath Unity package failed the semver policy check (see docs/semver-policy.md)."
+}
+
 # The tracked DLL and pdb are committed beside their source, so neither may name a commit: Source Link
 # writes the commit SHA into the pdb, and the DLL carries that pdb's content id.
 dotnet build $projectPath -c $Configuration -f netstandard2.1 -o $buildRoot --no-incremental `

packages/cultmath/shaders/CultMath.hlsl

@@ -11,7 +11,6 @@
 static const float CULTMATH_PI = 3.14159265358979323846;
 static const float CULTMATH_TAU = 6.28318530717958647692;
 static const float CULTMATH_HALF_PI = 1.57079632679489661923;
-static const float CULTMATH_NORMALIZE_EPSILON = 1.0e-20;
 
 float cultmath_radians(float degrees_value) { return degrees_value * (CULTMATH_PI / 180.0); }
 float cultmath_degrees(float radians_value) { return radians_value * (180.0 / CULTMATH_PI); }
@@ -171,10 +170,6 @@ float cultmath_distance(float2 left, float2 right) { return length(left - right)
 float cultmath_distance(float3 left, float3 right) { return length(left - right); }
 float cultmath_distance(float4 left, float4 right) { return length(left - right); }
 
-float2 cultmath_normalize(float2 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
-float3 cultmath_normalize(float3 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
-float4 cultmath_normalize(float4 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
-
 float2 cultmath_reflect(float2 incident, float2 normal_value)
 {
     return incident - 2.0 * dot(normal_value, incident) * normal_value;
@@ -286,6 +281,38 @@ float cultmath_hash(float value) { return cultmath_frac(sin(value) * 43758.5453)
 float cultmath_hash(float2 value) { return cultmath_hash(dot(value, float2(127.1, 311.7))); }
 float cultmath_hash(float3 value) { return cultmath_hash(dot(value, float3(127.1, 311.7, 74.7))); }
 
+// PCG hashes (Jarzynski and Olano, JCGT 2020), written over scalar uints so CultMath's int3/int4 carry the bits.
+uint cultmath_pcg(uint value)
+{
+    uint state = value * 747796405u + 2891336453u;
+    uint word = ((state >> (int)((state >> 28) + 4)) ^ state) * 277803737u;
+    return (word >> 22) ^ word;
+}
+
+int3 cultmath_pcg3d(int3 value)
+{
+    uint x = (uint)value.x * 1664525u + 1013904223u, y = (uint)value.y * 1664525u + 1013904223u, z = (uint)value.z * 1664525u + 1013904223u;
+    x += y * z; y += z * x; z += x * y;
+    x ^= x >> 16; y ^= y >> 16; z ^= z >> 16;
+    x += y * z; y += z * x; z += x * y;
+    return int3((int)x, (int)y, (int)z);
+}
+
+int3 cultmath_pcg3d(float2 value) { return cultmath_pcg3d(float3(value, 0.0)); }
+int3 cultmath_pcg3d(float3 value) { return cultmath_pcg3d(int3((int)asuint(value.x), (int)asuint(value.y), (int)asuint(value.z))); }
+
+int4 cultmath_pcg4d(int4 value)
+{
+    uint x = (uint)value.x * 1664525u + 1013904223u, y = (uint)value.y * 1664525u + 1013904223u;
+    uint z = (uint)value.z * 1664525u + 1013904223u, w = (uint)value.w * 1664525u + 1013904223u;
+    x += y * w; y += z * x; z += x * y; w += y * z;
+    x ^= x >> 16; y ^= y >> 16; z ^= z >> 16; w ^= w >> 16;
+    x += y * w; y += z * x; z += x * y; w += y * z;
+    return int4((int)x, (int)y, (int)z, (int)w);
+}
+
+int4 cultmath_pcg4d(float4 value) { return cultmath_pcg4d(int4((int)asuint(value.x), (int)asuint(value.y), (int)asuint(value.z), (int)asuint(value.w))); }
+
 float cultmath_value_noise(float2 position)
 {
     float2 cell = floor(position);

packages/cultmath/src/CultMath/CultMath.csproj

@@ -8,7 +8,7 @@
     <RootNamespace>CultMath</RootNamespace>
     <AssemblyName>CultMath</AssemblyName>
     <PackageId>GameCult.Math</PackageId>
-    <Version>0.2.0</Version>
+    <Version>0.2.3</Version>
     <Description>Clean-room C# math shaped for HLSL-style renderer code.</Description>
     <Authors>GameCult</Authors>
     <PackageReadmeFile>README.md</PackageReadmeFile>

packages/cultmath/src/CultMath/Swizzles.g.cs

@@ -7,6 +7,8 @@ namespace CultMath;
 public partial struct float2
 {
     public float2(float2 xy) : this(xy.x, xy.y) { }
+    public float2(int2 value) : this(value.x, value.y) { }
+    public float2(bool2 value) : this(value.x ? 1.0f : 0.0f, value.y ? 1.0f : 0.0f) { }
     public float r { readonly get => x; set => x = value; }
     public float g { readonly get => y; set => y = value; }
     public readonly float2 xx => new(x, x);
@@ -72,6 +74,8 @@ public partial struct float3
     public float3(float x, float2 yz) : this(x, yz.x, yz.y) { }
     public float3(float2 xy, float z) : this(xy.x, xy.y, z) { }
     public float3(float3 xyz) : this(xyz.x, xyz.y, xyz.z) { }
+    public float3(int3 value) : this(value.x, value.y, value.z) { }
+    public float3(bool3 value) : this(value.x ? 1.0f : 0.0f, value.y ? 1.0f : 0.0f, value.z ? 1.0f : 0.0f) { }
     public float r { readonly get => x; set => x = value; }
     public float g { readonly get => y; set => y = value; }
     public float b { readonly get => z; set => z = value; }
@@ -320,6 +324,8 @@ public partial struct float4
     public float4(float2 xy, float2 zw) : this(xy.x, xy.y, zw.x, zw.y) { }
     public float4(float3 xyz, float w) : this(xyz.x, xyz.y, xyz.z, w) { }
     public float4(float4 xyzw) : this(xyzw.x, xyzw.y, xyzw.z, xyzw.w) { }
+    public float4(int4 value) : this(value.x, value.y, value.z, value.w) { }
+    public float4(bool4 value) : this(value.x ? 1.0f : 0.0f, value.y ? 1.0f : 0.0f, value.z ? 1.0f : 0.0f, value.w ? 1.0f : 0.0f) { }
     public float r { readonly get => x; set => x = value; }
     public float g { readonly get => y; set => y = value; }
     public float b { readonly get => z; set => z = value; }
@@ -1001,6 +1007,8 @@ public partial struct float4
 public partial struct int2
 {
     public int2(int2 xy) : this(xy.x, xy.y) { }
+    public int2(float2 value) : this((int)value.x, (int)value.y) { }
+    public int2(bool2 value) : this(value.x ? 1 : 0, value.y ? 1 : 0) { }
     public int r { readonly get => x; set => x = value; }
     public int g { readonly get => y; set => y = value; }
     public readonly int2 xx => new(x, x);
@@ -1066,6 +1074,8 @@ public partial struct int3
     public int3(int x, int2 yz) : this(x, yz.x, yz.y) { }
     public int3(int2 xy, int z) : this(xy.x, xy.y, z) { }
     public int3(int3 xyz) : this(xyz.x, xyz.y, xyz.z) { }
+    public int3(float3 value) : this((int)value.x, (int)value.y, (int)value.z) { }
+    public int3(bool3 value) : this(value.x ? 1 : 0, value.y ? 1 : 0, value.z ? 1 : 0) { }
     public int r { readonly get => x; set => x = value; }
     public int g { readonly get => y; set => y = value; }
     public int b { readonly get => z; set => z = value; }
@@ -1314,6 +1324,8 @@ public partial struct int4
     public int4(int2 xy, int2 zw) : this(xy.x, xy.y, zw.x, zw.y) { }
     public int4(int3 xyz, int w) : this(xyz.x, xyz.y, xyz.z, w) { }
     public int4(int4 xyzw) : this(xyzw.x, xyzw.y, xyzw.z, xyzw.w) { }
+    public int4(float4 value) : this((int)value.x, (int)value.y, (int)value.z, (int)value.w) { }
+    public int4(bool4 value) : this(value.x ? 1 : 0, value.y ? 1 : 0, value.z ? 1 : 0, value.w ? 1 : 0) { }
     public int r { readonly get => x; set => x = value; }
     public int g { readonly get => y; set => y = value; }
     public int b { readonly get => z; set => z = value; }
@@ -1995,6 +2007,8 @@ public partial struct int4
 public partial struct bool2
 {
     public bool2(bool2 xy) : this(xy.x, xy.y) { }
+    public bool2(float2 value) : this(value.x != 0.0f, value.y != 0.0f) { }
+    public bool2(int2 value) : this(value.x != 0, value.y != 0) { }
     public bool r { readonly get => x; set => x = value; }
     public bool g { readonly get => y; set => y = value; }
     public readonly bool2 xx => new(x, x);
@@ -2060,6 +2074,8 @@ public partial struct bool3
     public bool3(bool x, bool2 yz) : this(x, yz.x, yz.y) { }
     public bool3(bool2 xy, bool z) : this(xy.x, xy.y, z) { }
     public bool3(bool3 xyz) : this(xyz.x, xyz.y, xyz.z) { }
+    public bool3(float3 value) : this(value.x != 0.0f, value.y != 0.0f, value.z != 0.0f) { }
+    public bool3(int3 value) : this(value.x != 0, value.y != 0, value.z != 0) { }
     public bool r { readonly get => x; set => x = value; }
     public bool g { readonly get => y; set => y = value; }
     public bool b { readonly get => z; set => z = value; }
@@ -2308,6 +2324,8 @@ public partial struct bool4
     public bool4(bool2 xy, bool2 zw) : this(xy.x, xy.y, zw.x, zw.y) { }
     public bool4(bool3 xyz, bool w) : this(xyz.x, xyz.y, xyz.z, w) { }
     public bool4(bool4 xyzw) : this(xyzw.x, xyzw.y, xyzw.z, xyzw.w) { }
+    public bool4(float4 value) : this(value.x != 0.0f, value.y != 0.0f, value.z != 0.0f, value.w != 0.0f) { }
+    public bool4(int4 value) : this(value.x != 0, value.y != 0, value.z != 0, value.w != 0) { }
     public bool r { readonly get => x; set => x = value; }
     public bool g { readonly get => y; set => y = value; }
     public bool b { readonly get => z; set => z = value; }
@@ -3102,9 +3120,15 @@ public partial struct double3
 public static partial class math
 {
     public static float2 float2(float2 xy) => new(xy);
+    public static float2 float2(int2 value) => new(value);
+    public static float2 float2(bool2 value) => new(value);
+    public static float2 float2(int value) => new(value, value);
     public static float3 float3(float x, float2 yz) => new(x, yz);
     public static float3 float3(float2 xy, float z) => new(xy, z);
     public static float3 float3(float3 xyz) => new(xyz);
+    public static float3 float3(int3 value) => new(value);
+    public static float3 float3(bool3 value) => new(value);
+    public static float3 float3(int value) => new(value, value, value);
     public static float4 float4(float x, float y, float2 zw) => new(x, y, zw);
     public static float4 float4(float x, float2 yz, float w) => new(x, yz, w);
     public static float4 float4(float x, float3 yzw) => new(x, yzw);
@@ -3112,10 +3136,17 @@ public static partial class math
     public static float4 float4(float2 xy, float2 zw) => new(xy, zw);
     public static float4 float4(float3 xyz, float w) => new(xyz, w);
     public static float4 float4(float4 xyzw) => new(xyzw);
+    public static float4 float4(int4 value) => new(value);
+    public static float4 float4(bool4 value) => new(value);
+    public static float4 float4(int value) => new(value, value, value, value);
     public static int2 int2(int2 xy) => new(xy);
+    public static int2 int2(float2 value) => new(value);
+    public static int2 int2(bool2 value) => new(value);
     public static int3 int3(int x, int2 yz) => new(x, yz);
     public static int3 int3(int2 xy, int z) => new(xy, z);
     public static int3 int3(int3 xyz) => new(xyz);
+    public static int3 int3(float3 value) => new(value);
+    public static int3 int3(bool3 value) => new(value);
     public static int4 int4(int x, int y, int2 zw) => new(x, y, zw);
     public static int4 int4(int x, int2 yz, int w) => new(x, yz, w);
     public static int4 int4(int x, int3 yzw) => new(x, yzw);
@@ -3123,10 +3154,16 @@ public static partial class math
     public static int4 int4(int2 xy, int2 zw) => new(xy, zw);
     public static int4 int4(int3 xyz, int w) => new(xyz, w);
     public static int4 int4(int4 xyzw) => new(xyzw);
+    public static int4 int4(float4 value) => new(value);
+    public static int4 int4(bool4 value) => new(value);
     public static bool2 bool2(bool2 xy) => new(xy);
+    public static bool2 bool2(float2 value) => new(value);
+    public static bool2 bool2(int2 value) => new(value);
     public static bool3 bool3(bool x, bool2 yz) => new(x, yz);
     public static bool3 bool3(bool2 xy, bool z) => new(xy, z);
     public static bool3 bool3(bool3 xyz) => new(xyz);
+    public static bool3 bool3(float3 value) => new(value);
+    public static bool3 bool3(int3 value) => new(value);
     public static bool4 bool4(bool x, bool y, bool2 zw) => new(x, y, zw);
     public static bool4 bool4(bool x, bool2 yz, bool w) => new(x, yz, w);
     public static bool4 bool4(bool x, bool3 yzw) => new(x, yzw);
@@ -3134,4 +3171,6 @@ public static partial class math
     public static bool4 bool4(bool2 xy, bool2 zw) => new(xy, zw);
     public static bool4 bool4(bool3 xyz, bool w) => new(xyz, w);
     public static bool4 bool4(bool4 xyzw) => new(xyzw);
+    public static bool4 bool4(float4 value) => new(value);
+    public static bool4 bool4(int4 value) => new(value);
 }

packages/cultmath/src/CultMath/math.cs

@@ -105,6 +105,9 @@ public static partial class math
     public static float2 frac(float2 value) => value - floor(value);
     public static float3 frac(float3 value) => value - floor(value);
     public static float4 frac(float4 value) => value - floor(value);
+    // dxc has no double Frc: it demotes to float, as it does for exp and lerp. CultMath's double
+    // overloads keep double precision instead, so frac(double) is x - floor(x) in double.
+    public static double frac(double value) => value - Math.Floor(value);
 
     // dxc lowers float min/max/clamp to DXIL FMin/FMax (saturate to Saturate, defined as FMin(1, FMax(0, x))).
     // DXIL.rst: FMin(a, b) is a < b ? a : b, FMax(a, b) is a >= b ? a : b, and a NaN operand returns the other.
@@ -130,6 +133,11 @@ public static partial class math
     public static float2 clamp(float2 value, float2 minimum, float2 maximum) => min(max(value, minimum), maximum);
     public static float3 clamp(float3 value, float3 minimum, float3 maximum) => min(max(value, minimum), maximum);
     public static float4 clamp(float4 value, float4 minimum, float4 maximum) => min(max(value, minimum), maximum);
+    // dxc lowers int clamp to IMin(IMax(x, a), b): inverted bounds return b rather than throwing like Math.Clamp.
+    public static int clamp(int value, int minimum, int maximum) => min(max(value, minimum), maximum);
+    public static int2 clamp(int2 value, int2 minimum, int2 maximum) => min(max(value, minimum), maximum);
+    public static int3 clamp(int3 value, int3 minimum, int3 maximum) => min(max(value, minimum), maximum);
+    public static int4 clamp(int4 value, int4 minimum, int4 maximum) => min(max(value, minimum), maximum);
 
     // DXIL Saturate is FMin(1, FMax(0, x)); that operand order, unlike clamp(x, 0, 1), maps -0 to +0.
     public static float saturate(float value) => min(1.0f, max(0.0f, value));
@@ -205,9 +213,10 @@ public static partial class math
     public static float distance(float3 left, float3 right) => length(left - right);
     public static float distance(float4 left, float4 right) => length(left - right);
 
-    public static float2 normalize(float2 value) => value / max(length(value), 1.0e-20f);
-    public static float3 normalize(float3 value) => value / max(length(value), 1.0e-20f);
-    public static float4 normalize(float4 value) => value / max(length(value), 1.0e-20f);
+    // dxc lowers normalize(x) to x * Rsqrt(Dot(x, x)), and DXIL Rsqrt is 1 / sqrt(src): a zero vector is 0 * inf = NaN.
+    public static float2 normalize(float2 value) => value * (1.0f / MathF.Sqrt(dot(value, value)));
+    public static float3 normalize(float3 value) => value * (1.0f / MathF.Sqrt(dot(value, value)));
+    public static float4 normalize(float4 value) => value * (1.0f / MathF.Sqrt(dot(value, value)));
     public static quaternion normalize(quaternion value)
     {
         var length = MathF.Sqrt(value.x * value.x + value.y * value.y + value.z * value.z + value.w * value.w);
@@ -373,6 +382,43 @@ public static partial class math
     public static float hash(float2 value) => hash(dot(value, new float2(127.1f, 311.7f)));
     public static float hash(float3 value) => hash(dot(value, new float3(127.1f, 311.7f, 74.7f)));
 
+    public static uint asuint(float value) => (uint)BitConverter.SingleToInt32Bits(value);
+
+    // PCG hashes from Jarzynski and Olano, "Hash Functions for GPU Rendering" (JCGT 9(3), 2020). Integer-only, so
+    // dxc and C# agree bit for bit. pcg3d/pcg4d carry uint bit patterns in int3/int4; float overloads hash IEEE bits.
+    public static uint pcg(uint value)
+    {
+        var state = value * 747796405u + 2891336453u;
+        var word = ((state >> (int)((state >> 28) + 4)) ^ state) * 277803737u;
+        return (word >> 22) ^ word;
+    }
+
+    public static int3 pcg3d(int3 value)
+    {
+        uint x = (uint)value.x * 1664525u + 1013904223u, y = (uint)value.y * 1664525u + 1013904223u, z = (uint)value.z * 1664525u + 1013904223u;
+        x += y * z; y += z * x; z += x * y;
+        x ^= x >> 16; y ^= y >> 16; z ^= z >> 16;
+        x += y * z; y += z * x; z += x * y;
+        return new int3((int)x, (int)y, (int)z);
+    }
+
+    // The paper hashes 2 -> N inputs through pcg3d with the unused component held constant.
+    public static int3 pcg3d(float2 value) => pcg3d(new float3(value, 0.0f));
+    public static int3 pcg3d(float3 value) => pcg3d(new int3((int)asuint(value.x), (int)asuint(value.y), (int)asuint(value.z)));
+
+    public static int4 pcg4d(int4 value)
+    {
+        uint x = (uint)value.x * 1664525u + 1013904223u, y = (uint)value.y * 1664525u + 1013904223u;
+        uint z = (uint)value.z * 1664525u + 1013904223u, w = (uint)value.w * 1664525u + 1013904223u;
+        x += y * w; y += z * x; z += x * y; w += y * z;
+        x ^= x >> 16; y ^= y >> 16; z ^= z >> 16; w ^= w >> 16;
+        x += y * w; y += z * x; z += x * y; w += y * z;
+        return new int4((int)x, (int)y, (int)z, (int)w);
+    }
+
+    public static int4 pcg4d(float4 value) =>
+        pcg4d(new int4((int)asuint(value.x), (int)asuint(value.y), (int)asuint(value.z), (int)asuint(value.w)));
+
     public static float log(float value) => MathF.Log(value);
     public static float2 log(float2 value) => new(log(value.x), log(value.y));
     public static float3 log(float3 value) => new(log(value.x), log(value.y), log(value.z));
@@ -475,6 +521,74 @@ public static partial class math
             a._m20 * b._m01 + a._m21 * b._m11 + a._m22 * b._m21,
             a._m20 * b._m02 + a._m21 * b._m12 + a._m22 * b._m22);
 
+    // Abramowitz & Stegun 7.1.26, a single-precision rational/exponential fit with a stated
+    // max absolute error of 1.5e-7. erf is odd, so only x >= 0 is fit and the sign is restored.
+    // Measured against an independent reference: worst absolute error 6.621e-7, inside the
+    // 2e-6 bar this package's tests pin.
+    public static float erf(float value)
+    {
+        const float p = 0.3275911f;
+        const float a1 = 0.254829592f;
+        const float a2 = -0.284496736f;
+        const float a3 = 1.421413741f;
+        const float a4 = -1.453152027f;
+        const float a5 = 1.061405429f;
+
+        var s = sign(value);
+        var x = abs(value);
+        var t = 1.0f / (1.0f + p * x);
+        var poly = ((((a5 * t + a4) * t + a3) * t + a2) * t + a1) * t;
+        var result = 1.0f - poly * exp(-x * x);
+        return s * result;
+    }
+
+    // Giles, "Approximating the erfinv function" (GPU Computing Gems, 2010): a single-precision
+    // minimax polynomial in two ranges of w = -ln((1-x)(1+x)), central and tail.
+    // Domain is [-1, 1]. Outside it, including +-infinity, the result is NaN (there is no real
+    // inverse). At the edges the mathematical limit is infinite: erfinv(1) = +infinity and
+    // erfinv(-1) = -infinity. The unguarded polynomial hits log(0) = -infinity at those edges and
+    // the tail branch's leading coefficient is negative, so it delivers the wrong sign; guard the
+    // edges explicitly instead of trusting the fit through the singularity.
+    // Measured against an independent reference: worst absolute error 5.066e-7, and the
+    // erf(erfinv(y)) round trip 6.109e-7 worst case, both inside the 2e-6 bar this package's
+    // tests pin.
+    public static float erfinv(float value)
+    {
+        if (value >= 1.0f) return value > 1.0f ? float.NaN : float.PositiveInfinity;
+        if (value <= -1.0f) return value < -1.0f ? float.NaN : float.NegativeInfinity;
+
+        var w = -log((1.0f - value) * (1.0f + value));
+        float p;
+        if (w < 5.0f)
+        {
+            w -= 2.5f;
+            p = 2.81022636e-08f;
+            p = 3.43273939e-07f + p * w;
+            p = -3.5233877e-06f + p * w;
+            p = -4.39150654e-06f + p * w;
+            p = 0.00021858087f + p * w;
+            p = -0.00125372503f + p * w;
+            p = -0.00417768164f + p * w;
+            p = 0.246640727f + p * w;
+            p = 1.50140941f + p * w;
+        }
+        else
+        {
+            w = sqrt(w) - 3.0f;
+            p = -0.000200214257f;
+            p = 0.000100950558f + p * w;
+            p = 0.00134934322f + p * w;
+            p = -0.00367342844f + p * w;
+            p = 0.00573950773f + p * w;
+            p = -0.0076224613f + p * w;
+            p = 0.00943887047f + p * w;
+            p = 1.00167406f + p * w;
+            p = 2.83297682f + p * w;
+        }
+
+        return p * value;
+    }
+
     // Ashima Arts / Ian McEwan 3D simplex noise (MIT), mirrored by cultmath_snoise(float3)
     // in shaders/CultMath.hlsl with the same float32 evaluation order.
     public static float snoise(float3 value)

packages/cultmath/tests/CultMath.Tests/HlslMirrorTests.cs

@@ -31,7 +31,6 @@ public sealed class HlslMirrorTests
             "cultmath_smootherstep",
             "cultmath_lengthsq",
             "cultmath_distance",
-            "cultmath_normalize",
             "cultmath_reflect",
             "cultmath_rotate",
             "cultmath_csum",
@@ -41,6 +40,9 @@ public sealed class HlslMirrorTests
             "cultmath_quadratic_bezier",
             "cultmath_cubic_bezier",
             "cultmath_hash",
+            "cultmath_pcg(uint",
+            "cultmath_pcg3d(int3",
+            "cultmath_pcg4d(int4",
             "cultmath_value_noise",
             "cultmath_snoise(float2",
             "cultmath_snoise(float3",
@@ -54,8 +56,8 @@ public sealed class HlslMirrorTests
             Assert.Contains(symbol, include);
         }
 
-        Assert.Contains("CULTMATH_NORMALIZE_EPSILON", include);
-        Assert.Contains("max(length(value), CULTMATH_NORMALIZE_EPSILON)", include);
+        // HLSL's normalize intrinsic is the contract; a mirror copy would only restate it.
+        Assert.DoesNotContain("cultmath_normalize", include);
     }
 
     private static string GetCultMathRoot()

packages/cultmath/tests/CultMath.Tests/HlslSemanticsTests.cs

@@ -187,6 +187,33 @@ public sealed class HlslSemanticsTests
         Assert.Equal(DoubleBits(-0.0), DoubleBits(math.max(-0.0, 0.0)));
         Assert.Equal(DoubleBits(0.0), DoubleBits(math.min(-0.0, 0.0)));
 
+        // dxc: normalize(x) is x * Rsqrt(Dot(x, x)); length and distance are Sqrt of the summed squares.
+        static bool AllNaN(float4 value) =>
+            float.IsNaN(value.x) && float.IsNaN(value.y) && float.IsNaN(value.z) && float.IsNaN(value.w);
+        var n2 = math.normalize(float2.zero);
+        Assert.True(float.IsNaN(n2.x) && float.IsNaN(n2.y));
+        var n3 = math.normalize(float3.zero);
+        Assert.True(float.IsNaN(n3.x) && float.IsNaN(n3.y) && float.IsNaN(n3.z));
+        Assert.True(AllNaN(math.normalize(float4.zero)));
+        var nanX = math.normalize(new float2(float.NaN, 2.41f));
+        Assert.True(float.IsNaN(nanX.x) && float.IsNaN(nanX.y));
+        Assert.True(AllNaN(math.normalize(new float4(1.0f, float.NaN, 2.41f, 1.0f))));
+        var skew = new float3(0.25f, 1.0f, -0.1f);
+        var inverseLength = 1.0f / MathF.Sqrt(skew.x * skew.x + skew.y * skew.y + skew.z * skew.z);
+        var normalized = math.normalize(skew);
+        Assert.Equal(Bits(skew.x * inverseLength), Bits(normalized.x));
+        Assert.Equal(Bits(skew.y * inverseLength), Bits(normalized.y));
+        Assert.Equal(Bits(skew.z * inverseLength), Bits(normalized.z));
+        Assert.Equal(Bits(0.0f), Bits(math.length(float2.zero)));
+        Assert.Equal(Bits(0.0f), Bits(math.length(float3.zero)));
+        Assert.Equal(Bits(0.0f), Bits(math.length(float4.zero)));
+        Assert.Equal(Bits(0.0f), Bits(math.distance(new float3(1.0f, 2.0f, 3.0f), new float3(1.0f, 2.0f, 3.0f))));
+
+        // asuint(float) reinterprets the IEEE-754 bits.
+        Assert.Equal(0x80000000u, math.asuint(-0.0f));
+        Assert.Equal(0x3FC00000u, math.asuint(1.5f));
+        Assert.Equal(0x7FC00000u, math.asuint(BitConverter.Int32BitsToSingle(0x7FC00000)));
+
         Assert.Equal(0, math.sign(float.NaN));
         Assert.Equal(-1, math.sign(-0.5f));
         Assert.Equal(new int3(-1, 0, 1), math.sign(new float3(-2.0f, 0.0f, 4.0f)));
@@ -311,6 +338,43 @@ public sealed class HlslSemanticsTests
         Assert.Equal(new int4(5, 5, 5, 5), math.int4(5));
     }
 
+    [Fact]
+    public void VectorConversionsFollowDxc()
+    {
+        // fptosi truncates toward zero; NaN and out-of-range inputs are undefined in DXIL and not pinned.
+        Assert.Equal(new int2(-1, 2), math.int2(new float2(-1.7f, 2.9f)));
+        Assert.Equal(new int3(0, 0, 3), new int3(new float3(-0.5f, 0.5f, 3.99f)));
+        Assert.Equal(new float4(1.0f, -2.0f, 3.0f, 0.0f), math.float4(new int4(1, -2, 3, 0)));
+        // Numeric to bool is `!= 0` (fcmp une for float, so NaN is true); bool to numeric is 0 or 1.
+        Assert.Equal(new bool2(true, false), math.bool2(new float2(float.NaN, -0.0f)));
+        Assert.Equal(new bool3(false, true, true), math.bool3(new int3(0, 5, -1)));
+        Assert.Equal(new float2(1.0f, 0.0f), math.float2(new bool2(true, false)));
+        Assert.Equal(new int4(0, 1, 1, 0), math.int4(new bool4(false, true, true, false)));
+        // intN(intN) is exact; it must not promote through float and lose 2^24 + 1.
+        Assert.Equal(new int2(16777217, -16777217), math.int2(new int2(16777217, -16777217)));
+        float2 splat = math.float2(0);
+        Assert.Equal(float2.zero, splat);
+    }
+
+    [Fact]
+    public void FracAndIntegerClampFollowHlsl()
+    {
+        // frac(double) keeps double precision; a float frac of 1e9 + 0.25 would return 0.
+        Assert.Equal(0.25, math.frac(1.0e9 + 0.25));
+        Assert.Equal(0.75, math.frac(-0.25));
+        Assert.Equal(0.5f, math.frac(2.5f));
+
+        // IMin(IMax(x, a), b): the result stays int, and inverted bounds return b.
+        int clamped = math.clamp(7, -1, 3);
+        Assert.Equal(3, clamped);
+        Assert.Equal(-1, math.clamp(-5, -1, 3));
+        Assert.Equal(0, math.clamp(1, 3, 0));
+        Assert.Equal(new int2(0, 3), math.clamp(new int2(-4, 9), 0, 3));
+        Assert.Equal(new int3(1, 2, 3), math.clamp(new int3(1, 2, 3), new int3(0, 0, 0), new int3(5, 5, 5)));
+        Assert.Equal(new int4(2, 2, 4, 4), math.clamp(new int4(1, 2, 5, 4), new int4(2), new int4(4)));
+        Assert.Equal(1.0f, math.clamp(2.0f, -1, 1));
+    }
+
     [Fact]
     public void MatrixMulFollowsHlslRowMajorConvention()
     {

packages/cultmath/tests/CultMath.Tests/HlslSourceCompatibilityTests.cs

@@ -78,26 +78,33 @@ public sealed class HlslSourceCompatibilityTests
             foreach (var input in cases)
             {
                 var slot = 0;
-                var args = types.Select(t => t == typeof(float) ? (object)input(slot++)
-                    : Activator.CreateInstance(t, Enumerable.Range(0, Components(t)).Select(_ => (object)input(slot++)).ToArray())!).ToArray();
-                var expected = Floats(counterpart.Invoke(null, args)!);
-                var actual = Floats(mirror.Invoke(shader, args)!);
-                if (expected.Length != actual.Length || expected.Zip(actual).Any(p => !(float.IsNaN(p.First) && float.IsNaN(p.Second))
-                    && BitConverter.SingleToInt32Bits(p.First) != BitConverter.SingleToInt32Bits(p.Second)))
+                var args = types.Select(t => Scalars.Contains(t) ? Scalar(t, input(slot++))
+                    : Activator.CreateInstance(t, Components(t).Select(f => Scalar(f.FieldType, input(slot++))).ToArray())!).ToArray();
+                var expected = Values(counterpart.Invoke(null, args)!);
+                var actual = Values(mirror.Invoke(shader, args)!);
+                if (expected.Length != actual.Length || expected.Zip(actual).Any(p => p.First is float a && p.Second is float b
+                    ? !(float.IsNaN(a) && float.IsNaN(b)) && BitConverter.SingleToInt32Bits(a) != BitConverter.SingleToInt32Bits(b)
+                    : !p.First.Equals(p.Second)))
                 {
-                    mismatches.Add($"{mirror.Name}({string.Join(", ", args.Select(a => string.Join(" ", Floats(a))))}): C# {string.Join(" ", expected)}, mirror {string.Join(" ", actual)}");
+                    mismatches.Add($"{mirror.Name}({string.Join(", ", args.Select(a => string.Join(" ", Values(a))))}): C# {string.Join(" ", expected)}, mirror {string.Join(" ", actual)}");
                 }
             }
         }
 
         Assert.True(mismatches.Count == 0, $"{mismatches.Count} mismatches:{Environment.NewLine}{string.Join(Environment.NewLine, mismatches.Take(12))}");
-        Assert.Equal(26, compared.Count);
+        Assert.Equal(28, compared.Count);
     }
 
-    private static int Components(Type t) => t.GetFields().Count(f => f.FieldType == typeof(float) && !f.IsStatic);
+    // Integer arguments take the bit pattern of the float input, so specials become 0, 0x80000000, NaN bits, ...
+    private static readonly Type[] Scalars = { typeof(float), typeof(int), typeof(uint) };
 
-    private static float[] Floats(object value) => value is float f ? new[] { f }
-        : value.GetType().GetFields().Where(field => field.FieldType == typeof(float) && !field.IsStatic).Select(field => (float)field.GetValue(value)!).ToArray();
+    private static object Scalar(Type t, float f) => t == typeof(float) ? f
+        : t == typeof(int) ? BitConverter.SingleToInt32Bits(f) : (object)(uint)BitConverter.SingleToInt32Bits(f);
+
+    private static FieldInfo[] Components(Type t) => t.GetFields().Where(f => !f.IsStatic && Scalars.Contains(f.FieldType)).ToArray();
+
+    private static object[] Values(object value) => Scalars.Contains(value.GetType()) ? new[] { value }
+        : Components(value.GetType()).Select(field => field.GetValue(value)!).ToArray();
 
     /// <summary>The documented HLSL-to-C# transformations, and nothing else.</summary>
     internal static string TransformHlslToCSharp(string hlsl)

packages/cultmath/tests/CultMath.Tests/MathTests.cs

@@ -12,6 +12,41 @@ public sealed class MathTests
         Assert.Equal(0.75f, math.frac(-1.25f));
     }
 
+    // Expected values come from a Python transcription of the paper's pcg3d/pcg4d (JCGT 9(3) 2020, p. 32) and
+    // O'Neill's pcg_output_rxs_m_xs_32_32 with PCG_DEFAULT_MULTIPLIER_32/INCREMENT_32, independent of this code.
+    [Fact]
+    public void PcgHashesMatchReferenceTranscription()
+    {
+        static int3 U3(uint x, uint y, uint z) => new((int)x, (int)y, (int)z);
+        static int4 U4(uint x, uint y, uint z, uint w) => new((int)x, (int)y, (int)z, (int)w);
+
+        Assert.Equal(0x07BB2FE2u, math.pcg(0u));
+        Assert.Equal(0xA8BEEA3Cu, math.pcg(1u));
+        Assert.Equal(0x995312E1u, math.pcg(0x12345678u));
+        Assert.Equal(0xE62A4902u, math.pcg(0xFFFFFFFFu));
+        Assert.Equal(U3(0x9BAFD7C6u, 0xA8E88A6Bu, 0x3F15482Cu), math.pcg3d(new int3(0, 0, 0)));
+        Assert.Equal(U3(0xFA9F79A6u, 0x48F2F44Cu, 0x596F5AB1u), math.pcg3d(new int3(1, 2, 3)));
+        Assert.Equal(U3(0x67DCF282u, 0x49E87E17u, 0x10018917u), math.pcg3d(U3(0xFFFFFFFFu, 0x80000000u, 0x7FFFFFFFu)));
+        Assert.Equal(U4(0x0F02F829u, 0x2D568769u, 0x32B0C43Bu, 0xD32548EAu), math.pcg4d(new int4(0, 0, 0, 0)));
+        Assert.Equal(U4(0x3622CD16u, 0xF11471D8u, 0xE1109B3Fu, 0x02B94C2Fu), math.pcg4d(new int4(1, 2, 3, 4)));
+        Assert.Equal(U4(0x72180037u, 0x81D493E6u, 0xD9BA7226u, 0x14C9ABA7u), math.pcg4d(U4(0xFFFFFFFFu, 0x80000000u, 0x7FFFFFFFu, 0xDEADBEEFu)));
+        Assert.Equal(U3(0xA7B40FEEu, 0x9B70DFC0u, 0x3106C2C5u), math.pcg3d(new float3(1.5f, -2.25f, 1e7f)));
+        Assert.Equal(U3(0x5A09E5C6u, 0x53EC0DABu, 0x4BE4A1ECu), math.pcg3d(new float2(3.0f, 4.0f)));
+        Assert.Equal(U4(0x1849E380u, 0xF199DEE0u, 0x6C6B4934u, 0x34AF16DFu),
+            math.pcg4d(new float4(-0.0f, BitConverter.Int32BitsToSingle(0x7FC00000), 0.5f, 1e-7f)));
+    }
+
+    [Fact]
+    public void Pcg3dSeparatesAPositionGrid()
+    {
+        // A single 32-bit component is subject to birthday collisions (x has one here); the full output is distinct.
+        var hashes = new HashSet<int3>();
+        for (var i = 0; i < 100; i++)
+        for (var j = 0; j < 100; j++)
+            hashes.Add(math.pcg3d(new float2(i * 0.5f - 25.0f, j * 0.5f - 25.0f)));
+        Assert.Equal(10000, hashes.Count);
+    }
+
     [Fact]
     public void VectorOperationsAreComponentWise()
     {
@@ -332,4 +367,160 @@ public sealed class MathTests
         Assert.Equal(0.0f, px[1], precision: 5);
         Assert.Equal(0.0f, py[1], precision: 5);
     }
+
+    // Tabulated to 16 significant figures (Abramowitz & Stegun table 7.1 lineage / standard erf tables).
+    [Theory]
+    [InlineData(0.0f, 0.0)]
+    [InlineData(0.5f, 0.5204998778130465)]
+    [InlineData(-0.5f, -0.5204998778130465)]
+    [InlineData(1.0f, 0.8427007929497149)]
+    [InlineData(-1.0f, -0.8427007929497149)]
+    [InlineData(2.0f, 0.9953222650189527)]
+    [InlineData(-2.0f, -0.9953222650189527)]
+    [InlineData(3.0f, 0.9999779095030014)]
+    [InlineData(-3.0f, -0.9999779095030014)]
+    public void ErfMatchesReferenceValues(float x, double expected)
+    {
+        Assert.True(
+            Math.Abs(math.erf(x) - expected) <= 2e-6,
+            $"erf({x}) = {math.erf(x)}, expected {expected}");
+    }
+
+    [Fact]
+    public void ErfIsOdd()
+    {
+        for (var i = -30; i <= 30; i++)
+        {
+            var x = i / 10.0f;
+            Assert.Equal(-math.erf(x), math.erf(-x));
+        }
+    }
+
+    [Fact]
+    public void ErfApproachesItsLimitsOfPlusMinusOne()
+    {
+        Assert.Equal(1.0f, math.erf(6.0f));
+        Assert.Equal(1.0f, math.erf(20.0f));
+        Assert.Equal(-1.0f, math.erf(-6.0f));
+        Assert.Equal(-1.0f, math.erf(-20.0f));
+    }
+
+    [Fact]
+    public void ErfinvInvertsErf()
+    {
+        for (var i = -999; i <= 999; i++)
+        {
+            var y = i / 1000.0f;
+            var x = math.erfinv(y);
+            var roundTrip = math.erf(x);
+            Assert.True(
+                MathF.Abs(roundTrip - y) < 1e-5f,
+                $"erf(erfinv({y})) = {roundTrip}");
+        }
+    }
+
+    // Reference values from bisecting the platform's double-precision erf (Python's math.erf,
+    // glibc-backed), not this package's own erf, to 200 iterations over [-6, 6] -- effectively
+    // exact at float precision. This is what ErfinvInvertsErf cannot be: a check against this
+    // package's own erf only proves the two functions agree with each other, not that either is
+    // numerically correct. Soul measured the round-trip test alone to be blind to a coefficient
+    // change that degraded erfinv's worst error 300-400x (5.0e-7 to 2.0e-4).
+    [Theory]
+    // Expected values are computed for the actual float32-rounded input (e.g. the literal
+    // 0.999f is really 0.9990000128746033 as a double), not the decimal literal, because
+    // erfinv's derivative diverges near +-1: at y = 0.999f that rounding alone moves the
+    // true answer by ~2.6e-6, larger than the test's own error bar, if ignored.
+    [InlineData(0.0f, 0.0)]
+    [InlineData(0.1f, 0.08885599182530649)]
+    [InlineData(-0.1f, -0.08885599182530649)]
+    [InlineData(0.3f, 0.2724627261055238)]
+    [InlineData(-0.3f, -0.2724627261055238)]
+    [InlineData(0.5f, 0.4769362762044699)]
+    [InlineData(-0.5f, -0.4769362762044699)]
+    [InlineData(0.7f, 0.7328690598827587)]
+    [InlineData(-0.7f, -0.732869059882759)]
+    [InlineData(0.9f, 1.1630870719457724)]
+    [InlineData(-0.9f, -1.1630870719457729)]
+    [InlineData(0.95f, 1.3859037522360764)]
+    [InlineData(-0.95f, -1.3859037522360773)]
+    [InlineData(0.99f, 1.8213866009002766)]
+    [InlineData(-0.99f, -1.8213866009002793)]
+    [InlineData(0.999f, 2.3267563267961435)]
+    [InlineData(-0.999f, -2.3267563267961657)]
+    [InlineData(0.9999f, 2.751035437903192)]
+    [InlineData(-0.9999f, -2.751035437903383)]
+    public void ErfinvMatchesReferenceValues(float y, double expected)
+    {
+        Assert.True(
+            Math.Abs(math.erfinv(y) - expected) <= 2e-6,
+            $"erfinv({y}) = {math.erfinv(y)}, expected {expected}");
+    }
+
+    [Fact]
+    public void ErfinvAtDomainEdgesAndBeyond()
+    {
+        // Domain is [-1, 1]. The edges are the correctly-signed infinite limits; anything
+        // outside, including +-infinity itself, has no real inverse and is NaN.
+        Assert.Equal(float.PositiveInfinity, math.erfinv(1.0f));
+        Assert.Equal(float.NegativeInfinity, math.erfinv(-1.0f));
+        Assert.True(float.IsNaN(math.erfinv(1.0001f)));
+        Assert.True(float.IsNaN(math.erfinv(-1.0001f)));
+        Assert.True(float.IsNaN(math.erfinv(2.0f)));
+        Assert.True(float.IsNaN(math.erfinv(-2.0f)));
+        Assert.True(float.IsNaN(math.erfinv(float.PositiveInfinity)));
+        Assert.True(float.IsNaN(math.erfinv(float.NegativeInfinity)));
+        Assert.True(float.IsNaN(math.erfinv(float.NaN)));
+    }
+
+    // The deleted ErfinvIsMonotonicallyIncreasing asserted a property erfinv does not have:
+    // Soul measured 9662 backward steps scanning every representable float32 in [0, 0.999999],
+    // first at y = 0.00022214651, worst drop 5.960464e-8 (one ULP at that scale) -- invisible
+    // only because that fixture stepped by 0.001. erf has the same shape: 100 backward steps
+    // over [0, 4.5], worst drop 1.192093e-7. Pin what is actually true: monotone to within a
+    // tolerance comfortably above that measured noise floor.
+    [Fact]
+    public void ErfinvIsMonotonicWithinFloatingPointTolerance()
+    {
+        const float tolerance = 1e-6f;
+        var previous = float.NegativeInfinity;
+        for (var i = -999; i <= 999; i++)
+        {
+            var y = i / 1000.0f;
+            var x = math.erfinv(y);
+            Assert.True(
+                x >= previous - tolerance,
+                $"erfinv({y}) = {x} dropped more than {tolerance} below previous value {previous}");
+            previous = x;
+        }
+    }
+
+    // One property the consumer needs, not the whole of correctness: fire control turns
+    // adjacent erf values into a cell's probability mass, so a backward step in erf would
+    // show up as a negative mass. An erf that returned a constant would pass this and is
+    // caught by ErfMatchesReferenceValues instead.
+    // Soul checked these geometries clean: 16/64/256/1024/4096 cells over
+    // +-4 sigma, plus a tight 1 sigma spread and a very tight 0.25 sigma spread.
+    [Theory]
+    [InlineData(16, 4f)]
+    [InlineData(64, 4f)]
+    [InlineData(256, 4f)]
+    [InlineData(1024, 4f)]
+    [InlineData(4096, 4f)]
+    [InlineData(256, 1f)]
+    [InlineData(64, 0.25f)]
+    public void ErfCellMassesStayNonNegativeAcrossRealisticGeometries(int cells, float sigmaRange)
+    {
+        var lo = -sigmaRange;
+        var hi = sigmaRange;
+        var step = (hi - lo) / cells;
+        var previous = math.erf(lo / MathF.Sqrt(2f));
+        for (var i = 1; i <= cells; i++)
+        {
+            var edge = lo + step * i;
+            var current = math.erf(edge / MathF.Sqrt(2f));
+            var mass = current - previous;
+            Assert.True(mass >= 0f, $"cell {i} of {cells} over +-{sigmaRange} sigma has negative mass {mass}");
+            previous = current;
+        }
+    }
 }

packages/cultmath/tools/generate-swizzles.ps1

@@ -21,6 +21,19 @@ $families = @(
     @{ Scalar = "bool"; Sizes = @(2, 3, 4); Functions = $true },
     @{ Scalar = "double"; Sizes = @(2, 3); Functions = $false }
 )
+# Same-size vector conversions, as dxc lowers them: float to int is fptosi (toward zero; NaN
+# and out-of-range are undefined in DXIL), int to float is sitofp, numeric to bool is `!= 0`
+# (fcmp une, so NaN is true), bool to numeric is 0 or 1. Keyed "target<-source"; {0} is a
+# source component. Identity forms (intN(intN), ...) come from the composition loop, which
+# also keeps an int vector argument off the lossy intN(floatN) overload.
+$conversions = [ordered]@{
+    "float<-int" = "{0}"
+    "float<-bool" = "{0} ? 1.0f : 0.0f"
+    "int<-float" = "(int){0}"
+    "int<-bool" = "{0} ? 1 : 0"
+    "bool<-float" = "{0} != 0.0f"
+    "bool<-int" = "{0} != 0"
+}
 $componentFields = @("x", "y", "z", "w")
 $namings = @(@("x", "y", "z", "w"), @("r", "g", "b", "a"))
 
@@ -86,6 +99,20 @@ foreach ($family in $families) {
             }
         }
 
+        foreach ($source in @("float", "int", "bool")) {
+            $expression = $conversions["$scalar<-$source"]
+            if (-not $expression) { continue }
+            $converted = for ($i = 0; $i -lt $size; $i++) { $expression -f "value.$($componentFields[$i])" }
+            Line "    public $type($source$size value) : this($($converted -join ', ')) { }"
+            if ($family.Functions) {
+                $functionLines.Add("    public static $type $type($source$size value) => new(value);")
+            }
+        }
+        if ($scalar -eq "float" -and $family.Functions) {
+            # floatN(int) splat: without it floatN(0) is ambiguous between floatN(float) and floatN(intN).
+            $functionLines.Add("    public static $type $type(int value) => new($((@('value') * $size) -join ', '));")
+        }
+
         # Single-component color aliases; x/y/z/w are the fields themselves.
         $letters = $namings[1]
         for ($i = 0; $i -lt $size; $i++) {

packages/cultmath/unity/org.gamecult.cultmath/Shaders/CultMath.hlsl

@@ -11,7 +11,6 @@
 static const float CULTMATH_PI = 3.14159265358979323846;
 static const float CULTMATH_TAU = 6.28318530717958647692;
 static const float CULTMATH_HALF_PI = 1.57079632679489661923;
-static const float CULTMATH_NORMALIZE_EPSILON = 1.0e-20;
 
 float cultmath_radians(float degrees_value) { return degrees_value * (CULTMATH_PI / 180.0); }
 float cultmath_degrees(float radians_value) { return radians_value * (180.0 / CULTMATH_PI); }
@@ -171,10 +170,6 @@ float cultmath_distance(float2 left, float2 right) { return length(left - right)
 float cultmath_distance(float3 left, float3 right) { return length(left - right); }
 float cultmath_distance(float4 left, float4 right) { return length(left - right); }
 
-float2 cultmath_normalize(float2 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
-float3 cultmath_normalize(float3 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
-float4 cultmath_normalize(float4 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
-
 float2 cultmath_reflect(float2 incident, float2 normal_value)
 {
     return incident - 2.0 * dot(normal_value, incident) * normal_value;
@@ -286,6 +281,38 @@ float cultmath_hash(float value) { return cultmath_frac(sin(value) * 43758.5453)
 float cultmath_hash(float2 value) { return cultmath_hash(dot(value, float2(127.1, 311.7))); }
 float cultmath_hash(float3 value) { return cultmath_hash(dot(value, float3(127.1, 311.7, 74.7))); }
 
+// PCG hashes (Jarzynski and Olano, JCGT 2020), written over scalar uints so CultMath's int3/int4 carry the bits.
+uint cultmath_pcg(uint value)
+{
+    uint state = value * 747796405u + 2891336453u;
+    uint word = ((state >> (int)((state >> 28) + 4)) ^ state) * 277803737u;
+    return (word >> 22) ^ word;
+}
+
+int3 cultmath_pcg3d(int3 value)
+{
+    uint x = (uint)value.x * 1664525u + 1013904223u, y = (uint)value.y * 1664525u + 1013904223u, z = (uint)value.z * 1664525u + 1013904223u;
+    x += y * z; y += z * x; z += x * y;
+    x ^= x >> 16; y ^= y >> 16; z ^= z >> 16;
+    x += y * z; y += z * x; z += x * y;
+    return int3((int)x, (int)y, (int)z);
+}
+
+int3 cultmath_pcg3d(float2 value) { return cultmath_pcg3d(float3(value, 0.0)); }
+int3 cultmath_pcg3d(float3 value) { return cultmath_pcg3d(int3((int)asuint(value.x), (int)asuint(value.y), (int)asuint(value.z))); }
+
+int4 cultmath_pcg4d(int4 value)
+{
+    uint x = (uint)value.x * 1664525u + 1013904223u, y = (uint)value.y * 1664525u + 1013904223u;
+    uint z = (uint)value.z * 1664525u + 1013904223u, w = (uint)value.w * 1664525u + 1013904223u;
+    x += y * w; y += z * x; z += x * y; w += y * z;
+    x ^= x >> 16; y ^= y >> 16; z ^= z >> 16; w ^= w >> 16;
+    x += y * w; y += z * x; z += x * y; w += y * z;
+    return int4((int)x, (int)y, (int)z, (int)w);
+}
+
+int4 cultmath_pcg4d(float4 value) { return cultmath_pcg4d(int4((int)asuint(value.x), (int)asuint(value.y), (int)asuint(value.z), (int)asuint(value.w))); }
+
 float cultmath_value_noise(float2 position)
 {
     float2 cell = floor(position);

packages/cultmath/unity/org.gamecult.cultmath/package.json

@@ -1,7 +1,7 @@
 {
   "name": "org.gamecult.cultmath",
   "displayName": "CultMath",
-  "version": "0.2.0",
+  "version": "0.2.3",
   "unity": "2021.3",
   "description": "Precompiled CultMath numeric primitives and matching HLSL semantics for GameCult Unity runtimes.",
   "license": "MPL-2.0",

packages/cultmesh-browser/src/index.ts

@@ -15,42 +15,28 @@ import {
   type CultMeshSessionAcceptedMessage,
   type CultMeshSessionOpenMessage,
 } from "cultnet-ts/contracts";
+import {
+  base64ToBytes,
+  bytesToBase64,
+  isLoopbackEndpoint,
+  isUnsignedCertificate,
+  routeCertificateView,
+  verifyAuthorityRoute,
+  verifyProviderSessionProof,
+  type CultMeshAuthorityIdentity,
+  type CultMeshAuthorityRouteCertificate,
+  type CultMeshAuthorityRouteView,
+  type CultMeshAuthorityTrustMode,
+  type CultMeshAuthorityTrustPolicy,
+  type CultMeshP256PublicKey,
+} from "cultnet-ts/authority";
 
-export interface CultMeshBrowserIdentity {
-  verseId: string;
-  authorityRuntimeId: string;
-}
-
-export interface CultMeshBrowserRoute extends CultMeshBrowserIdentity {
-  endpoint: string;
-  protocolId?: string;
-  protocolIds?: readonly string[];
-  priority?: number;
-  generation: string;
-  certificate?: CultMeshBrowserRouteCertificate;
-}
-
-export interface CultMeshBrowserP256PublicKey {
-  keyId: string;
-  x: string;
-  y: string;
-}
-
-export interface CultMeshBrowserRouteCertificate {
-  providerKey: CultMeshBrowserP256PublicKey;
-  odinKeyId: string;
-  issuedAtUnixMilliseconds: number;
-  expiresAtUnixMilliseconds: number;
-  signature: string;
-}
-
-export type CultMeshBrowserAuthorityTrustMode = "authenticated-remote" | "local-development";
-
-export interface CultMeshBrowserAuthorityTrustPolicy {
-  mode: CultMeshBrowserAuthorityTrustMode;
-  odinRoots?: readonly CultMeshBrowserP256PublicKey[];
-  now?: () => number;
-}
+export type CultMeshBrowserIdentity = CultMeshAuthorityIdentity;
+export type CultMeshBrowserRoute = CultMeshAuthorityRouteView;
+export type CultMeshBrowserP256PublicKey = CultMeshP256PublicKey;
+export type CultMeshBrowserRouteCertificate = CultMeshAuthorityRouteCertificate;
+export type CultMeshBrowserAuthorityTrustMode = CultMeshAuthorityTrustMode;
+export type CultMeshBrowserAuthorityTrustPolicy = CultMeshAuthorityTrustPolicy;
 
 export interface CultMeshBrowserRendezvous {
   resolve(
@@ -794,19 +780,6 @@ export function decodeCultNetOperationPayload<T>(response: CultNetOperationRespo
   return decode(base64ToBytes(response.payload)) as T;
 }
 
-function bytesToBase64(bytes: Uint8Array): string {
-  let binary = "";
-  for (let offset = 0; offset < bytes.length; offset += 0x8000) {
-    binary += String.fromCharCode(...bytes.subarray(offset, offset + 0x8000));
-  }
-  return btoa(binary);
-}
-
-function base64ToBytes(value: string): Uint8Array {
-  const binary = atob(value);
-  return Uint8Array.from(binary, character => character.charCodeAt(0));
-}
-
 function requireWebSocketEndpoint(value: string, field: string): URL {
   let endpoint: URL;
   try {
@@ -898,17 +871,7 @@ async function selectOdinRoute(
       protocolIds: route.protocolIds,
       priority: route.priority,
       generation: route.generation,
-      ...(route.certificate ? { certificate: {
-        providerKey: {
-          keyId: route.certificate.providerKeyId,
-          x: route.certificate.providerPublicKeyX,
-          y: route.certificate.providerPublicKeyY,
-        },
-        odinKeyId: route.certificate.odinKeyId,
-        issuedAtUnixMilliseconds: route.certificate.issuedAtUnixMilliseconds,
-        expiresAtUnixMilliseconds: route.certificate.expiresAtUnixMilliseconds,
-        signature: route.certificate.signature,
-      } } : {}),
+      ...(route.certificate ? { certificate: routeCertificateView(route.certificate) } : {}),
     };
     try {
       await verifyAuthorityRoute(candidate, trust);
@@ -941,136 +904,26 @@ async function validateSessionAcceptance(
       `expected '${request.verseId}/${request.authorityRuntimeId}/${protocolId}/${route.generation}'.`,
     );
   }
-  if (trust.mode === "local-development" && isLoopbackEndpoint(route.endpoint) && !route.certificate) return undefined;
+  // `CultMeshVerifiedAuthorityRoute.IsLocalDevelopment` in C#: an unsigned
+  // loopback route under local-development needs no provider session proof.
+  if (trust.mode === "local-development" && isLoopbackEndpoint(route.endpoint) && isUnsignedCertificate(route.certificate)) {
+    return undefined;
+  }
   const providerKey = route.certificate?.providerKey;
   if (!providerKey || message.providerKeyId !== providerKey.keyId || !message.providerSignature) {
     return new Error("CultMesh authority did not prove possession of the Odin-certified provider key.");
   }
-  if (!await verifyP256(providerKey, canonicalSession(request, route.endpoint), message.providerSignature)) {
+  if (!await verifyProviderSessionProof(request, route.endpoint, providerKey, message.providerSignature)) {
     return new Error("CultMesh provider session proof is invalid.");
   }
   return undefined;
 }
 
-async function verifyAuthorityRoute(
-  route: CultMeshBrowserRoute,
-  trust: CultMeshBrowserAuthorityTrustPolicy,
-): Promise<void> {
-  const certificate = route.certificate;
-  if (!certificate) {
-    if (trust.mode === "local-development" && isLoopbackEndpoint(route.endpoint)) return;
-    throw new Error("Remote CultMesh routes require an Odin-signed authority certificate.");
-  }
-  const endpoint = new URL(route.endpoint);
-  if (endpoint.protocol !== "wss:" && !(trust.mode === "local-development" && isLoopbackEndpoint(route.endpoint))) {
-    throw new Error("Authenticated remote CultMesh browser routes require wss:// channel protection.");
-  }
-  const now = trust.now?.() ?? Date.now();
-  if (now < certificate.issuedAtUnixMilliseconds || now >= certificate.expiresAtUnixMilliseconds) {
-    throw new Error("The Odin route certificate is not currently valid.");
-  }
-  const root = trust.odinRoots?.find(candidate => candidate.keyId === certificate.odinKeyId);
-  if (!root) throw new Error(`Odin key '${certificate.odinKeyId}' is not trusted by this consumer.`);
-  if (!await verifyP256(root, canonicalRoute(route), certificate.signature)) {
-    throw new Error("The Odin route certificate signature is invalid.");
-  }
-}
-
-function canonicalRoute(route: CultMeshBrowserRoute): Uint8Array {
-  const certificate = route.certificate!;
-  return canonicalFields(
-    "gamecult.cultmesh.route-certificate.v1",
-    route.verseId,
-    route.authorityRuntimeId,
-    route.endpoint,
-    [...(route.protocolIds ?? [route.protocolId ?? "cultmesh.documents.v1"])].sort().join("\u001f"),
-    String(route.priority ?? 0),
-    route.generation,
-    certificate.providerKey.keyId,
-    certificate.providerKey.x,
-    certificate.providerKey.y,
-    certificate.odinKeyId,
-    String(certificate.issuedAtUnixMilliseconds),
-    String(certificate.expiresAtUnixMilliseconds),
-  );
-}
-
-function canonicalSession(request: CultMeshSessionOpenMessage, endpoint: string): Uint8Array {
-  return canonicalFields(
-    "gamecult.cultmesh.session-proof.v1",
-    request.clientNonce,
-    request.messageId,
-    request.sourceRuntimeId,
-    request.verseId,
-    request.authorityRuntimeId,
-    request.protocolId,
-    endpoint,
-    request.routeGeneration,
-  );
-}
-
-function canonicalFields(...values: string[]): Uint8Array {
-  const encoder = new TextEncoder();
-  const encoded = values.map(value => encoder.encode(value));
-  const total = encoded.reduce((sum, value) => sum + 4 + value.byteLength, 0);
-  const result = new Uint8Array(total);
-  const view = new DataView(result.buffer);
-  let offset = 0;
-  for (const value of encoded) {
-    view.setUint32(offset, value.byteLength, false);
-    offset += 4;
-    result.set(value, offset);
-    offset += value.byteLength;
-  }
-  return result;
-}
-
-async function verifyP256(
-  key: CultMeshBrowserP256PublicKey,
-  payload: Uint8Array,
-  signatureBase64: string,
-): Promise<boolean> {
-  try {
-    const x = base64ToBytes(key.x);
-    const y = base64ToBytes(key.y);
-    const signature = base64ToBytes(signatureBase64);
-    if (x.byteLength !== 32 || y.byteLength !== 32 || signature.byteLength !== 64) return false;
-    const raw = new Uint8Array(65);
-    raw[0] = 4;
-    raw.set(x, 1);
-    raw.set(y, 33);
-    const publicKey = await crypto.subtle.importKey(
-      "raw",
-      raw.slice().buffer as ArrayBuffer,
-      { name: "ECDSA", namedCurve: "P-256" },
-      false,
-      ["verify"],
-    );
-    return await crypto.subtle.verify(
-      { name: "ECDSA", hash: "SHA-256" },
-      publicKey,
-      signature.slice().buffer as ArrayBuffer,
-      payload.slice().buffer as ArrayBuffer,
-    );
-  } catch {
-    return false;
-  }
-}
-
 function randomNonce(): string {
   const bytes = crypto.getRandomValues(new Uint8Array(32));
   return bytesToBase64(bytes);
 }
 
-function isLoopbackEndpoint(value: string): boolean {
-  try {
-    const host = new URL(value).hostname.replace(/^\[|\]$/g, "").toLowerCase();
-    return host === "localhost" || host === "127.0.0.1" || host === "::1";
-  } catch {
-    return false;
-  }
-}
-
 function requireText(value: string, field: string): void {
   if (!value || value.trim().length === 0) throw new Error(`CultMesh browser ${field} is required.`);
 }

packages/cultmesh-browser/test/cultmesh-browser.test.ts

@@ -236,6 +236,54 @@ test("browser client rejects a credential-free authority impersonator", async ()
   );
 });
 
+test("browser client opens an unsigned-certificate loopback session under local-development without a provider proof, as in C#", async () => {
+  const connect = (route: CultMeshBrowserRoute, trust: { mode: "local-development" | "authenticated-remote"; odinRoots: CultMeshBrowserP256PublicKey[] }) =>
+    CultMeshBrowserClient.connect({
+      ...route,
+      runtimeId: "browser-unsigned-certificate-test",
+      rendezvous: { resolve: async () => route },
+      trust,
+      socketFactory: () => handshakeOnlySocket(route),
+    });
+  const blank = (route: CultMeshBrowserRoute, signature: string) =>
+    ({ ...route, certificate: { ...route.certificate!, signature } });
+
+  const loopback = await createSignedRoute("ws://127.0.0.1:4501/mesh");
+  const localTrust = { mode: "local-development" as const, odinRoots: [loopback.odinPublic] };
+  const remote = await createSignedRoute("wss://provider.example/mesh");
+
+  // Empty is the easy case. The whitespace signatures are the ones that catch a
+  // local re-reading of "unsigned" here: an inline `signature === ""` passes
+  // every other test in this file and fails these, and U+0085 also separates
+  // `String.prototype.trim` from the C# `char.IsWhiteSpace` the shared
+  // `isUnsignedCertificate` uses. Both sides of the session check have to read
+  // "unsigned" the same way, or the route verifier accepts a session the
+  // acceptance check then demands a provider proof for.
+  for (const signature of ["", "   ", "\u0085", "\u00a0\t\n"]) {
+    const label = JSON.stringify(signature);
+    const client = await connect(blank(loopback.route, signature), localTrust);
+    assert.equal(client.state, "connected", label);
+    await client.dispose();
+    await assert.rejects(
+      connect(blank(remote.route, signature), { mode: "local-development", odinRoots: [remote.odinPublic] }),
+      /Odin-signed authority certificate/,
+      label,
+    );
+    await assert.rejects(
+      connect(blank(remote.route, signature), { mode: "authenticated-remote", odinRoots: [remote.odinPublic] }),
+      /Odin-signed authority certificate/,
+      label,
+    );
+  }
+  // U+FEFF is whitespace to JavaScript and not to C#, so it is a signature, not
+  // an unsigned route, and the loopback route is refused for its bytes.
+  await assert.rejects(connect(blank(loopback.route, "\ufeff"), localTrust), /not base64|not IEEE P1363/);
+
+  // A signed loopback certificate is an authenticated route even under
+  // local-development; the provider must still prove its key.
+  await assert.rejects(connect(loopback.route, localTrust), /did not prove possession/);
+});
+
 test("browser client rejects a mutated or expired signed route before opening a provider socket", async () => {
   const fixture = await createSignedRoute("wss://provider.example/mesh");
   let opened = false;

packages/cultmesh-kotlin/src/main/kotlin/org/gamecult/cultmesh/CultMesh.kt

@@ -1359,7 +1359,7 @@ fun defineCultNetSchemaDescriptor(
     schemaJson = schemaJson,
 )
 
-private const val cultNetSchemaBase = "https://github.com/GameCult/cultnet-ts/contracts"
+private const val cultNetSchemaBase = "https://github.com/GameCult/CultLib/contracts/cultnet"
 
 private data class CultNetBuiltInSchemaSpec(
     val schemaVersion: String,
@@ -1377,58 +1377,58 @@ private val cultNetBuiltInSchemaSpecs = listOf(
         title = "CultNet Hello Message",
         schemaId = "$cultNetSchemaBase/cultnet.hello.schema.json",
         requiredFields = listOf("schemaVersion", "runtimeId", "runtimeKind"),
-        contentHash = "1d2114bf0c92a2dd5e07dd735778ceeb939402c6424550d6d281d9db423f56b3",
+        contentHash = "f660ef803f293e2882650b3981c6eed835bd8e595c9b880d6c6271e0dcbd79e4",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.document_delete.v0",
         title = "CultNet Document Delete Message",
         schemaId = "$cultNetSchemaBase/cultnet.document-delete.schema.json",
         requiredFields = listOf("schemaVersion", "messageId", "schemaId", "recordKey"),
-        contentHash = "037f7cf1b30756904e0bfada6bcff486269378997afbe3c4b6fc5c573fc8a4df",
+        contentHash = "ed7dc202e4f1ebe0d88c5d60c81c53005b44a2557698d3d3c5d2126c01b40f08",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.document_put_raw.v0",
         title = "CultNet Raw Document Put Message",
         schemaId = "$cultNetSchemaBase/cultnet.document-put-raw.schema.json",
-        contentHash = "b61e7e6cce8508653fbeccc4d956ef211c853a174d67c7e1903ce294e15985a2",
+        contentHash = "34b61b14b49cfc887728673f08aa0f33df7ccd401e79c77d3bc324c72e547177",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.snapshot_request.v0",
         title = "CultNet Snapshot Request Message",
         schemaId = "$cultNetSchemaBase/cultnet.snapshot-request.schema.json",
-        contentHash = "9f6546f51a1aab85978554e6908d7a59e96b3329feff7b35022be210495dd721",
+        contentHash = "05267d9b5eb450d4aa8979179f74ba3aec2f3a82fead7ba4a16ab5462c7750fa",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.snapshot_response_raw.v0",
         title = "CultNet Raw Snapshot Response Message",
         schemaId = "$cultNetSchemaBase/cultnet.snapshot-response-raw.schema.json",
-        contentHash = "0dbca3338a3ae5d4011aed2c973c75b9b47b6b9dfc0874459ac56da01fef4582",
+        contentHash = "fdefbdf5d6b0844dd0eabe2c7430d054295d78e41289f96b227dc39f4aab78b9",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.schema_catalog_request.v0",
         title = "CultNet Schema Catalog Request Message",
         schemaId = "$cultNetSchemaBase/cultnet.schema-catalog-request.schema.json",
         wireContracts = listOf("cultnet.schema.v0", "gamecult.networking.v0"),
-        contentHash = "bdd49b44428daf24b514c521e53027ec944aecfebb39ca0d10967661c303e096",
+        contentHash = "ed6d63e29de2d492bb831f030b26ff49ba6883cd2be791ec4936c385f765c76a",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.schema_catalog_response.v0",
         title = "CultNet Schema Catalog Response Message",
         schemaId = "$cultNetSchemaBase/cultnet.schema-catalog-response.schema.json",
         wireContracts = listOf("cultnet.schema.v0", "gamecult.networking.v0"),
-        contentHash = "b158de53d1ca614eacf2e05767122fb4b9e06504c037ad76c649cffdf71dd648",
+        contentHash = "10b4835d33181fe4b93a33e39b63886c5514899e93682de786e298f7e4a213e9",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.shard_catalog_request.v0",
         title = "CultNet Shard Catalog Request Message",
-        schemaId = "cultnet.shard_catalog_request.v0",
-        contentHash = "0abd131a1db12f6731010333b86e104d550160bd58f539b18413a2b61198fa38",
+        schemaId = "$cultNetSchemaBase/cultnet.shard-catalog-request.schema.json",
+        contentHash = "b4edecd8a24f68ebccf0aca9b429d234618ff7e8858a10123d0b328aeae7eb3f",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.shard_catalog_response.v0",
         title = "CultNet Shard Catalog Response Message",
-        schemaId = "cultnet.shard_catalog_response.v0",
-        contentHash = "93a0e90ac81bc6ab21b68925ad25e381edfac8773232333679d3275141cff37b",
+        schemaId = "$cultNetSchemaBase/cultnet.shard-catalog-response.schema.json",
+        contentHash = "d86a94c57d7820483912b8b5cef6214ac951d34cb2641d2d21dcb1f1bc0263c0",
     ),
     CultNetBuiltInSchemaSpec(
         schemaVersion = "cultnet.shard_log_request.v0",
@@ -1468,7 +1468,7 @@ private val cultNetBuiltInSchemaSpecs = listOf(
         schemaId = "$cultNetSchemaBase/cultnet.transport-profile.schema.json",
         kind = "shared_contract",
         requiredFields = listOf("schemaVersion", "runtimeId", "transports"),
-        contentHash = "84473264f543ca3443267999e43d72b7993b61b7b2ac53c642c9cbe8b6de0217",
+        contentHash = "63dfd484e1fd332c167caadf52cb5b4fe12d5ffea4415206c3ef111c196507aa",
     ),
 )
 
@@ -3717,16 +3717,16 @@ private fun cultNetReconnectControllerSchedulesAttemptsAndReset() {
 private const val interopDocumentType = "cultnet.interop-note"
 private const val interopSchemaVersion = "cultnet.interop_note.v0"
 private const val interopMutationIntentType = "cultnet.interop-note-mutation-intent"
-private const val interopMutationIntentSchemaId = "https://github.com/GameCult/cultnet-ts/integration/contracts/cultnet.interop-note-mutation-intent.schema.json"
+private const val interopMutationIntentSchemaId = "https://github.com/GameCult/CultLib/contracts/cultnet/interop/cultnet.interop-note-mutation-intent.schema.json"
 private const val interopMutationIntentSchemaVersion = "cultnet.interop_note_mutation_intent.v0"
 private const val interopMutationReceiptType = "cultnet.interop-note-mutation-receipt"
-private const val interopMutationReceiptSchemaId = "https://github.com/GameCult/cultnet-ts/integration/contracts/cultnet.interop-note-mutation-receipt.schema.json"
+private const val interopMutationReceiptSchemaId = "https://github.com/GameCult/CultLib/contracts/cultnet/interop/cultnet.interop-note-mutation-receipt.schema.json"
 private const val interopMutationReceiptSchemaVersion = "cultnet.interop_note_mutation_receipt.v0"
 private const val interopFireCommandType = "cultnet.interop-fire-weapon-command"
-private const val interopFireCommandSchemaId = "https://github.com/GameCult/cultnet-ts/integration/contracts/cultnet.interop-fire-weapon-command.schema.json"
+private const val interopFireCommandSchemaId = "https://github.com/GameCult/CultLib/contracts/cultnet/interop/cultnet.interop-fire-weapon-command.schema.json"
 private const val interopFireCommandSchemaVersion = "cultnet.interop_fire_weapon_command.v0"
 private const val interopFireReceiptType = "cultnet.interop-fire-weapon-receipt"
-private const val interopFireReceiptSchemaId = "https://github.com/GameCult/cultnet-ts/integration/contracts/cultnet.interop-fire-weapon-receipt.schema.json"
+private const val interopFireReceiptSchemaId = "https://github.com/GameCult/CultLib/contracts/cultnet/interop/cultnet.interop-fire-weapon-receipt.schema.json"
 private const val interopFireReceiptSchemaVersion = "cultnet.interop_fire_weapon_receipt.v0"
 private const val rudpInteropConnectionId = 0x43554c54L
 private const val rudpInteropMaxFragmentBytes = 1024
@@ -4627,11 +4627,11 @@ private fun cultNetBuiltInSchemaCatalogAdvertisesWireContracts() {
     check(schemaCatalogRequest["wireContracts"] == listOf("cultnet.schema.v0", "gamecult.networking.v0"))
     check(!schemaCatalogRequest.containsKey("schemaJson"))
     val shardCatalogRequest = schemas.single { it["schemaVersion"] == "cultnet.shard_catalog_request.v0" }
-    check(shardCatalogRequest["schemaId"] == "cultnet.shard_catalog_request.v0")
+    check(shardCatalogRequest["schemaId"] == "$cultNetSchemaBase/cultnet.shard-catalog-request.schema.json")
     check(shardCatalogRequest["wireContracts"] == listOf("cultnet.schema.v0"))
-    check(shardCatalogRequest["contentHash"] == "0abd131a1db12f6731010333b86e104d550160bd58f539b18413a2b61198fa38")
+    check(shardCatalogRequest["contentHash"] == "b4edecd8a24f68ebccf0aca9b429d234618ff7e8858a10123d0b328aeae7eb3f")
     val shardCatalogResponse = schemas.single { it["schemaVersion"] == "cultnet.shard_catalog_response.v0" }
-    check(shardCatalogResponse["schemaId"] == "cultnet.shard_catalog_response.v0")
+    check(shardCatalogResponse["schemaId"] == "$cultNetSchemaBase/cultnet.shard-catalog-response.schema.json")
     check(shardCatalogResponse["wireContracts"] == listOf("cultnet.schema.v0"))
 
     val inlineCatalog = cultNetBuiltInSchemaCatalog(includeSchemaJson = true)
@@ -4644,7 +4644,7 @@ private fun cultNetBuiltInSchemaCatalogAdvertisesWireContracts() {
     )
     val transportProfile = mapList(transportResponse.body["schemas"]).single()
     check(transportProfile["kind"] == "shared_contract")
-    check(transportProfile["contentHash"] == "84473264f543ca3443267999e43d72b7993b61b7b2ac53c642c9cbe8b6de0217")
+    check(transportProfile["contentHash"] == "63dfd484e1fd332c167caadf52cb5b4fe12d5ffea4415206c3ef111c196507aa")
     check(!transportProfile.containsKey("schemaJson"))
 
     val filteredTransportCatalog = CultMesh.createBuiltInSchemaCatalog(

packages/cultmesh-py/tests/test_cultmesh.py

@@ -1759,11 +1759,11 @@ class CultMeshTests(unittest.TestCase):
             )
             self.assertEqual(
                 builtins.list()[0].schema_id,
-                "https://github.com/GameCult/cultnet-ts/contracts/cultnet.transport-profile.schema.json",
+                "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.transport-profile.schema.json",
             )
             self.assertIsNone(builtins.list()[0].schema_json)
             peer_exchange_schema_id = (
-                "https://github.com/GameCult/cultnet-ts/contracts/cultmesh.peer-exchange-request.schema.json"
+                "https://github.com/GameCult/CultLib/contracts/cultnet/cultmesh.peer-exchange-request.schema.json"
             )
             filtered_builtin = CultMesh.create_builtin_schema_catalog(
                 include_schema_json=True,
@@ -4033,7 +4033,7 @@ class CultMeshTests(unittest.TestCase):
         self.assertIn("cultmesh.peer_exchange_response.v0", wire_descriptors)
         self.assertIn("cultnet.error.v0", {descriptor.schema_version for descriptor in synced_wire_descriptors})
         self.assertIn("cultnet.document_put_raw.v0", {descriptor.schema_version for descriptor in synced_wire_descriptors})
-        self.assertIsNotNone(synced_schema_catalog.get("https://github.com/GameCult/cultnet-ts/contracts/cultnet.document-put-raw.schema.json"))
+        self.assertIsNotNone(synced_schema_catalog.get("https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.document-put-raw.schema.json"))
         self.assertEqual(snapshot_response["documents"][0]["recordKey"], "note:1")
         self.assertEqual(typed_snapshot_response.documents[0].record_key, "note:1")
         self.assertEqual(typed_snapshot_response.documents[0].schema_id, "mesh.server_note.v1")

packages/cultmesh-ts/native/MANIFEST.txt

@@ -0,0 +1,9 @@
+msquic.version=2.5.9
+msquic.windows.source=https://www.nuget.org/api/v2/package/Microsoft.Native.Quic.MsQuic.OpenSSL/2.5.9 sha256=FEE9A664C0052DEEE66D40CED2E19BFE20BC423DE5AE5234CFC0CEBC22CA3F5E
+msquic.linux.source=https://packages.microsoft.com/debian/13/prod/pool/main/libm/libmsquic/libmsquic_2.5.9_amd64.deb sha256=1baa61ade0b7b4a99f6dcb6b00d9aedb12b5566d00918a325be7425e878e51ba
+bridge.commit=e5bf1c9243acb6b76de72c7864e3b79214177199
+build.workflow_run=https://github.com/GameCult/CultLib/actions/runs/35912386052
+build.release=none (TEMPORARY push-to-quic-cut6 trigger, no tag; see quic-native.yml history for the tagged release path)
+build.win32-x64.host=windows-2025-vs2026, cl.exe (MSVC) 19.51.36256.0
+build.linux-x64.host=ubuntu-24.04, container debian:13@sha256:f324c7ff54321e8d9c588493a20244965938ce0aa50bbd1022d38010e9ffc4b1, g++ (Debian 14.2.0-19) 14.2.0
+date=2026-09-23T19:54:08Z

packages/cultmesh-ts/native/MSQUIC-LICENSE.txt

@@ -0,0 +1,21 @@
+Copyright (c) Microsoft Corporation.
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/cultmesh-ts/native/SHA256SUMS

@@ -0,0 +1,4 @@
+9dae391a44d59f12e19baa08a44d86c7e8b4916ca5d40007a42d65913ce0896f *win32-x64/gamecult_mesh_quic_native.dll
+c17c65813fe007eb486a5270d244f3659261355795b27abb99bd19ff77539263 *win32-x64/msquic.dll
+0ee3d28324c79a5b0135368187e7bd75c1969ad94fc6985755e81de4ec96e430 *linux-x64/libgamecult_mesh_quic_native.so
+c09a72f9b3bfd9119044b305c6064731c1e1879411e6f54276474fb58b524b68 *linux-x64/libmsquic.so.2

packages/cultmesh-ts/package.json

@@ -12,13 +12,14 @@
     }
   },
   "files": [
-    "dist"
+    "dist",
+    "native"
   ],
   "scripts": {
     "build": "node ../../node_modules/typescript/bin/tsc -p tsconfig.json",
     "prepack": "node ../../node_modules/typescript/bin/tsc -p tsconfig.json",
     "typecheck": "node ../../node_modules/typescript/bin/tsc -p tsconfig.json --pretty false",
-    "test": "node ../../node_modules/typescript/bin/tsc -p tsconfig.json && node ../../node_modules/typescript/bin/tsc -p tsconfig.test.json && node --test dist-test/test/*.test.js"
+    "test": "node ../../node_modules/typescript/bin/tsc -p tsconfig.json && node ../../node_modules/typescript/bin/tsc -p tsconfig.test.json && node --expose-gc --test dist-test/test/*.test.js"
   },
   "keywords": [
     "cultmesh",
@@ -44,7 +45,8 @@
   "dependencies": {
     "@msgpack/msgpack": "^3.1.2",
     "@gamecult/cultcache-ts": "^0.14.0",
-    "cultnet-ts": "^0.2.0"
+    "cultnet-ts": "^0.2.0",
+    "koffi": "3.3.0"
   },
   "devDependencies": {
     "@types/node": "^24.0.0",

packages/cultmesh-ts/src/index.ts

@@ -34,6 +34,18 @@ import {
   type CultNetWireContract,
 } from "cultnet-ts";
 
+import {
+  CultMeshQuicRealtimeConnector,
+  CultMeshQuicRealtimeProvider,
+  CultMeshQuicRealtimeSessionManager,
+  parseQuicRealtimeEndpoint,
+  type CultMeshQuicRealtimeConnectorOptions,
+  type CultMeshQuicRealtimeProviderOptions,
+  type CultMeshQuicRealtimeSessionManagerOptions,
+} from "./realtime-quic";
+
+export * from "./realtime-wire";
+export * from "./realtime-quic";
 export * from "./provider-session";
 export * from "./provider-session-wire";
 export * from "./provider-rudp-transport";
@@ -6268,6 +6280,28 @@ export class CultMesh {
     }
     return CultMesh.createRudpPeerForPeer(runtimeId, connectionId, peer, options);
   }
+
+  public static parseQuicRealtimeEndpoint(endpoint: string): ReturnType<typeof parseQuicRealtimeEndpoint> {
+    return parseQuicRealtimeEndpoint(endpoint);
+  }
+
+  public static createQuicRealtimeConnector(
+    options: CultMeshQuicRealtimeConnectorOptions = {},
+  ): CultMeshQuicRealtimeConnector {
+    return new CultMeshQuicRealtimeConnector(options);
+  }
+
+  public static createQuicRealtimeSessionManager(
+    options: CultMeshQuicRealtimeSessionManagerOptions,
+  ): CultMeshQuicRealtimeSessionManager {
+    return new CultMeshQuicRealtimeSessionManager(options);
+  }
+
+  public static createQuicRealtimeProvider(
+    options: CultMeshQuicRealtimeProviderOptions,
+  ): Promise<CultMeshQuicRealtimeProvider> {
+    return CultMeshQuicRealtimeProvider.listen(options);
+  }
 }
 
 function cultMeshSchemaFromDefinition(

packages/cultmesh-ts/src/realtime-quic-native.ts

@@ -0,0 +1,583 @@
+// The koffi binding for `native/GameCult.Mesh.Quic.Native`'s C ABI v2
+// (`include/cultmesh_quic_native.h`). This file is the only place `koffi` is
+// imported, and it is imported lazily, inside `loadBindings`, so a consumer
+// that never touches QUIC (AetheriaEve Electron, Odin, Stonks, weksa) loads no
+// native module at all.
+//
+// No koffi callbacks. `cultmesh_quic_next_event` is the single blocking
+// export; `CultMeshQuicNativeRuntime` runs it on koffi's async thread pool in
+// one loop per process-wide runtime and dispatches decoded events to
+// registered listener/connection handlers by id. Every other export is a
+// plain synchronous call.
+//
+// Binary resolution: `CULTMESH_QUIC_NATIVE_DIR` when set (the development
+// loop and CI point it at `artifacts/quic-native/<platform>` straight from a
+// build), otherwise `path.join(__dirname, "..", "native", "<platform>-<arch>")`
+// (the committed tree a later cut lands; `__dirname` is `dist/` at runtime, so
+// this path holds in the repo, an `npm pack` tarball and a pnpm `file:` copy
+// alike). No `node_modules` lookup, no platform package, no registry.
+//
+// Two koffi quirks this file works around, both probed against the pinned
+// 3.3.0 build: `_Out_` does not auto-allocate storage, so every out
+// parameter is `koffi.alloc(type, 1)` written by the call and read back with
+// `koffi.decode(buffer, type)`; and a decoded 64-bit value (`void *`,
+// `uint64_t`) comes back as a plain `number` when it fits a safe integer,
+// not a `bigint`. `toBigInt64` below is the one place that coerces either
+// into the `bigint` every exported type in this module promises.
+
+import { existsSync } from "node:fs";
+import { join } from "node:path";
+
+/** One decoded native event, payload already sliced to `payload_length`. */
+export interface CultMeshQuicNativeEvent {
+  readonly type: number;
+  readonly streamKind: number;
+  readonly listenerId: bigint;
+  readonly connectionId: bigint;
+  readonly streamId: bigint;
+  readonly code: bigint;
+  readonly status: number;
+  readonly payload: Uint8Array;
+}
+
+export const CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION = 1;
+export const CULTMESH_QUIC_EVENT_CONNECTION_CONNECTED = 2;
+export const CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED = 3;
+export const CULTMESH_QUIC_EVENT_CONNECTION_SHUTDOWN = 4;
+export const CULTMESH_QUIC_EVENT_STREAM_STARTED = 5;
+export const CULTMESH_QUIC_EVENT_STREAM_FRAME = 6;
+export const CULTMESH_QUIC_EVENT_STREAM_SEND_COMPLETE = 7;
+export const CULTMESH_QUIC_EVENT_STREAM_SHUTDOWN = 8;
+export const CULTMESH_QUIC_EVENT_LISTENER_STOPPED = 9;
+
+export const CULTMESH_QUIC_SEND_COMPLETED = 0;
+export const CULTMESH_QUIC_SEND_CANCELED = 1;
+
+export const CULTMESH_QUIC_STREAM_RELIABLE = 1;
+export const CULTMESH_QUIC_STREAM_LATEST_ONLY = 2;
+
+export const CULTMESH_QUIC_RESULT_BAD_CALL = -1;
+export const CULTMESH_QUIC_RESULT_BAD_ARGUMENT = -2;
+
+type NativeEventListener = (event: CultMeshQuicNativeEvent) => void;
+/** Invoked once when a connection is faulted: a throwing listener, a malformed
+ * frame, or any other error raised while dispatching an event for it. */
+type NativeFaultHandler = (error: Error) => void;
+
+/** koffi decodes a 64-bit value as `number` when it fits a safe integer and as
+ * `bigint` otherwise (probed on the pinned 3.3.0 build); this is the single
+ * place that coerces either into the `bigint` every exported type promises. */
+function toBigInt64(value: number | bigint): bigint {
+  return typeof value === "bigint" ? value : BigInt(value);
+}
+
+/** The opaque native runtime handle: a `void *`, decoded by koffi as a `bigint`. */
+export type CultMeshQuicNativeHandle = bigint;
+
+interface NativeEventStruct {
+  type: number;
+  stream_kind: number;
+  listener_id: bigint;
+  connection_id: bigint;
+  stream_id: bigint;
+  code: bigint;
+  status: number;
+  payload_length: number;
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type KoffiLib = any;
+
+/** `nextEventAsync`'s signature, typed explicitly because `promisify` cannot
+ * infer one from koffi's untyped (`any`) async export. */
+type NextEventAsyncFn = (
+  runtime: CultMeshQuicNativeHandle,
+  timeoutMs: number,
+  outEvent: unknown,
+  payload: Uint8Array | null,
+  payloadCapacity: number,
+  outRequired: unknown,
+) => Promise<number>;
+
+/**
+ * The loaded native library: koffi itself, the declared struct, and the
+ * twelve raw v2 exports. Untyped (koffi is `any`); the runtime class methods
+ * below are the type surface for these calls, so wrapping them a second time
+ * in a typed interface would only restate what the methods already say. The
+ * type is inferred from `buildLibrary`'s return value instead of restated.
+ */
+// eslint-disable-next-line @typescript-eslint/no-use-before-define
+type LoadedNativeLibrary = ReturnType<typeof buildLibrary>;
+
+let libraryCache: LoadedNativeLibrary | undefined;
+
+function platformArchDir(): string {
+  return `${process.platform}-${process.arch}`;
+}
+
+function platformFileNames(): { bridge: string; dependency: string } {
+  if (process.platform === "win32") {
+    return { bridge: "gamecult_mesh_quic_native.dll", dependency: "msquic.dll" };
+  }
+  if (process.platform === "linux") {
+    return { bridge: "libgamecult_mesh_quic_native.so", dependency: "libmsquic.so.2" };
+  }
+  throw new Error(`CultMesh QUIC native binding does not support platform '${process.platform}'.`);
+}
+
+function resolveNativeDir(): string {
+  const configured = process.env.CULTMESH_QUIC_NATIVE_DIR;
+  if (configured && configured.length > 0) return configured;
+  return join(__dirname, "..", "native", platformArchDir());
+}
+
+/** Loads koffi, resolves the binary directory, and declares the ABI. */
+function buildLibrary() {
+  // Untyped on purpose: koffi's own type declarations are ESM-flavored and
+  // fight a CommonJS `typeof import(...)` reference under Node16 resolution.
+  // eslint-disable-next-line @typescript-eslint/no-var-requires, @typescript-eslint/no-explicit-any
+  const koffi: any = require("koffi");
+  const { bridge, dependency } = platformFileNames();
+  const dir = resolveNativeDir();
+  const bridgePath = join(dir, bridge);
+  const dependencyPath = join(dir, dependency);
+  if (!existsSync(bridgePath) || !existsSync(dependencyPath)) {
+    const envDir = process.env.CULTMESH_QUIC_NATIVE_DIR;
+    throw new Error(
+      "CultMesh QUIC native binaries were not found. Tried " +
+        `'${dir}' (${envDir ? "CULTMESH_QUIC_NATIVE_DIR" : "the package's committed native/ tree"}). ` +
+        "Set CULTMESH_QUIC_NATIVE_DIR to a directory built by scripts/build-quic-native.ps1 or " +
+        "scripts/build-quic-native.sh, or ship the committed native/ tree.",
+    );
+  }
+
+  // The dependent library must be resolvable before the bridge loads.
+  koffi.load(dependencyPath);
+  const bridgeLib = koffi.load(bridgePath);
+
+  const event = koffi.struct("cultmesh_quic_event", {
+    type: "uint32_t",
+    stream_kind: "uint32_t",
+    listener_id: "uint64_t",
+    connection_id: "uint64_t",
+    stream_id: "uint64_t",
+    code: "uint64_t",
+    status: "int32_t",
+    payload_length: "int32_t",
+    reserved: koffi.array("uint8_t", 16),
+  });
+
+  const runtimeOpenFn = bridgeLib.func(
+    "int32_t cultmesh_quic_runtime_open(str app_name, void **out_runtime)",
+  );
+  const runtimeCloseFn = bridgeLib.func("void cultmesh_quic_runtime_close(void *runtime)");
+  const listenerOpenFn = bridgeLib.func(
+    "int32_t cultmesh_quic_listener_open(void *runtime, str host, uint16_t port, " +
+      "uint8_t *pkcs12, int32_t pkcs12_length, str password, " +
+      "uint64_t *out_listener_id, uint16_t *out_bound_port)",
+  );
+  const listenerCloseFn = bridgeLib.func(
+    "void cultmesh_quic_listener_close(void *runtime, uint64_t listener_id)",
+  );
+  const connectionOpenFn = bridgeLib.func(
+    "int32_t cultmesh_quic_connection_open(void *runtime, str host, uint16_t port, " +
+      "uint64_t *out_connection_id)",
+  );
+  const connectionCertificateCompleteFn = bridgeLib.func(
+    "int32_t cultmesh_quic_connection_certificate_complete(void *runtime, uint64_t connection_id, int32_t accept)",
+  );
+  const connectionShutdownFn = bridgeLib.func(
+    "void cultmesh_quic_connection_shutdown(void *runtime, uint64_t connection_id, uint64_t code)",
+  );
+  const streamOpenFn = bridgeLib.func(
+    "int32_t cultmesh_quic_stream_open(void *runtime, uint64_t connection_id, uint8_t kind, " +
+      "uint64_t *out_stream_id)",
+  );
+  const streamSendFrameFn = bridgeLib.func(
+    "int32_t cultmesh_quic_stream_send_frame(void *runtime, uint64_t stream_id, " +
+      "uint8_t *encoded_frame, int32_t length, int32_t fin)",
+  );
+  const streamShutdownFn = bridgeLib.func(
+    "void cultmesh_quic_stream_shutdown(void *runtime, uint64_t stream_id, uint64_t code)",
+  );
+  const nextEventFn = bridgeLib.func(
+    "int32_t cultmesh_quic_next_event(void *runtime, int32_t timeout_ms, " +
+      `${event.name} *out_event, uint8_t *payload, int32_t payload_capacity, ` +
+      "int32_t *out_required)",
+  );
+  const lastErrorFn = bridgeLib.func(
+    "int32_t cultmesh_quic_last_error(void *runtime, uint8_t *destination, int32_t capacity)",
+  );
+
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  const { promisify } = require("node:util") as typeof import("node:util");
+  const nextEventAsync = promisify(nextEventFn.async) as NextEventAsyncFn;
+
+  return {
+    koffi,
+    event,
+    runtimeOpenFn,
+    runtimeCloseFn,
+    listenerOpenFn,
+    listenerCloseFn,
+    connectionOpenFn,
+    connectionCertificateCompleteFn,
+    connectionShutdownFn,
+    streamOpenFn,
+    streamSendFrameFn,
+    streamShutdownFn,
+    nextEventAsync,
+    lastErrorFn,
+  };
+}
+
+/** Lazily builds and caches the loaded native library. */
+function loadBindings(): LoadedNativeLibrary {
+  if (libraryCache) return libraryCache;
+  libraryCache = buildLibrary();
+  return libraryCache;
+}
+
+function readLastError(lib: LoadedNativeLibrary, runtime: CultMeshQuicNativeHandle): string {
+  const buffer = Buffer.alloc(1024);
+  const written = lib.lastErrorFn(runtime, buffer, buffer.length);
+  return written > 0 ? buffer.subarray(0, written).toString("utf8") : "CultMesh native QUIC call failed.";
+}
+
+/**
+ * One MsQuic registration and one event queue, shared process-wide.
+ * `open`/`release` are reference-counted: the underlying runtime opens on the
+ * first `open` and closes on the last matching `release`. `open`/`release`
+ * calls do not need to be paired 1:1 by the same caller as long as the counts
+ * balance overall.
+ */
+export class CultMeshQuicNativeRuntime {
+  private static shared: CultMeshQuicNativeRuntime | undefined;
+  private static refCountValue = 0;
+
+  /** Outstanding `open()` references not yet matched by `release()`. Test-visible: the UAF and eviction regression tests assert it returns to its baseline. */
+  static get refCount(): number {
+    return CultMeshQuicNativeRuntime.refCountValue;
+  }
+
+  private readonly handle: CultMeshQuicNativeHandle;
+  private readonly lib: LoadedNativeLibrary;
+  private readonly listenerListeners = new Map<bigint, NativeEventListener>();
+  private readonly connectionListeners = new Map<
+    bigint,
+    { listener: NativeEventListener; onFault?: NativeFaultHandler }
+  >();
+  private closed = false;
+  private pumpLoop: Promise<void>;
+
+  /**
+   * `nextEvent`'s out-parameter buffers, allocated once and reused for every
+   * call instead of per call: the pump is single-threaded with at most one
+   * `nextEvent` in flight (`nextEventAsync` is only ever awaited, never
+   * fired concurrently), so decode-then-reuse is safe. Freed once in
+   * `release()` after the pump loop has exited.
+   */
+  private readonly outEventBuffer: unknown;
+  private readonly outRequiredBuffer: unknown;
+
+  private constructor(handle: CultMeshQuicNativeHandle, lib: LoadedNativeLibrary) {
+    this.handle = handle;
+    this.lib = lib;
+    this.outEventBuffer = lib.koffi.alloc(lib.event, 1);
+    this.outRequiredBuffer = lib.koffi.alloc("int32_t", 1);
+    this.pumpLoop = this.pump();
+  }
+
+  static async open(): Promise<CultMeshQuicNativeRuntime> {
+    if (!CultMeshQuicNativeRuntime.shared) {
+      const lib = loadBindings();
+      const out = lib.koffi.alloc("void *", 1);
+      const status = lib.runtimeOpenFn(null, out);
+      if (status !== 0) {
+        lib.koffi.free(out);
+        throw new Error(`cultmesh_quic_runtime_open failed with status ${status}.`);
+      }
+      const handle = toBigInt64(lib.koffi.decode(out, "void *"));
+      lib.koffi.free(out);
+      CultMeshQuicNativeRuntime.shared = new CultMeshQuicNativeRuntime(handle, lib);
+    }
+    CultMeshQuicNativeRuntime.refCountValue += 1;
+    return CultMeshQuicNativeRuntime.shared;
+  }
+
+  /**
+   * Takes one more reference on this already-open runtime, synchronously —
+   * unlike `open()`, this never awaits a runtime-open call, so a caller
+   * already holding a live instance (a provider handing a reference to a
+   * newly accepted peer) can attach it in the same synchronous turn instead
+   * of crossing a microtask boundary that would leave the event a caller is
+   * mid-dispatching unowned until the next tick.
+   */
+  retain(): CultMeshQuicNativeRuntime {
+    CultMeshQuicNativeRuntime.refCountValue += 1;
+    return this;
+  }
+
+  /**
+   * Drops one reference; closes the shared runtime once none remain. Refuses
+   * a release when no reference is outstanding. The bridge header (section 4)
+   * forbids any host call beginning once `cultmesh_quic_runtime_close` has
+   * started, so this marks the runtime closed and waits for the pump to exit
+   * (it wakes within its 250 ms `nextEvent` timeout) before making that call:
+   * a queued, not-yet-started `nextEvent` call must never begin after close
+   * and run against freed memory.
+   */
+  async release(): Promise<void> {
+    if (CultMeshQuicNativeRuntime.refCountValue === 0) {
+      throw new Error("CultMeshQuicNativeRuntime.release called with no outstanding reference.");
+    }
+    CultMeshQuicNativeRuntime.refCountValue -= 1;
+    if (CultMeshQuicNativeRuntime.refCountValue > 0) return;
+    this.closed = true;
+    CultMeshQuicNativeRuntime.shared = undefined;
+    await this.pumpLoop;
+    this.lib.runtimeCloseFn(this.handle);
+    this.lib.koffi.free(this.outEventBuffer);
+    this.lib.koffi.free(this.outRequiredBuffer);
+  }
+
+  onListenerEvent(listenerId: bigint, listener: NativeEventListener): void {
+    this.listenerListeners.set(listenerId, listener);
+  }
+
+  offListenerEvent(listenerId: bigint): void {
+    this.listenerListeners.delete(listenerId);
+  }
+
+  /**
+   * Registers the event listener for one connection. `onFault`, if given, is
+   * invoked exactly once if `listener` (or anything it calls synchronously,
+   * such as a caller-supplied certificate validator) throws while dispatching
+   * an event for this connection: the pump isolates the fault to this
+   * connection, shuts it down at the native level, removes the listener, and
+   * keeps running for every other connection.
+   */
+  onConnectionEvent(connectionId: bigint, listener: NativeEventListener, onFault?: NativeFaultHandler): void {
+    this.connectionListeners.set(connectionId, { listener, onFault });
+  }
+
+  offConnectionEvent(connectionId: bigint): void {
+    this.connectionListeners.delete(connectionId);
+  }
+
+  listenerOpen(
+    host: string | null,
+    port: number,
+    pkcs12: Uint8Array,
+    password: string | null,
+  ): { listenerId: bigint; boundPort: number } {
+    const outListenerId = this.lib.koffi.alloc("uint64_t", 1);
+    const outBoundPort = this.lib.koffi.alloc("uint16_t", 1);
+    try {
+      const status = this.lib.listenerOpenFn(
+        this.handle,
+        host,
+        port,
+        pkcs12,
+        pkcs12.length,
+        password,
+        outListenerId,
+        outBoundPort,
+      );
+      if (status !== 0) {
+        throw new Error(`cultmesh_quic_listener_open failed: ${readLastError(this.lib, this.handle)}`);
+      }
+      return {
+        listenerId: toBigInt64(this.lib.koffi.decode(outListenerId, "uint64_t")),
+        boundPort: this.lib.koffi.decode(outBoundPort, "uint16_t") as number,
+      };
+    } finally {
+      this.lib.koffi.free(outListenerId);
+      this.lib.koffi.free(outBoundPort);
+    }
+  }
+
+  listenerClose(listenerId: bigint): void {
+    this.lib.listenerCloseFn(this.handle, listenerId);
+    this.offListenerEvent(listenerId);
+  }
+
+  connectionOpen(host: string, port: number): bigint {
+    const out = this.lib.koffi.alloc("uint64_t", 1);
+    try {
+      const status = this.lib.connectionOpenFn(this.handle, host, port, out);
+      if (status !== 0) {
+        throw new Error(`cultmesh_quic_connection_open failed: ${readLastError(this.lib, this.handle)}`);
+      }
+      return toBigInt64(this.lib.koffi.decode(out, "uint64_t"));
+    } finally {
+      this.lib.koffi.free(out);
+    }
+  }
+
+  connectionCertificateComplete(connectionId: bigint, accept: boolean): void {
+    const status = this.lib.connectionCertificateCompleteFn(this.handle, connectionId, accept ? 1 : 0);
+    if (status !== 0) {
+      throw new Error(
+        `cultmesh_quic_connection_certificate_complete failed: ${readLastError(this.lib, this.handle)}`,
+      );
+    }
+  }
+
+  connectionShutdown(connectionId: bigint, code: bigint): void {
+    this.lib.connectionShutdownFn(this.handle, connectionId, code);
+  }
+
+  streamOpen(connectionId: bigint, kind: number): bigint {
+    const out = this.lib.koffi.alloc("uint64_t", 1);
+    try {
+      const status = this.lib.streamOpenFn(this.handle, connectionId, kind, out);
+      if (status !== 0) {
+        throw new Error(`cultmesh_quic_stream_open failed: ${readLastError(this.lib, this.handle)}`);
+      }
+      return toBigInt64(this.lib.koffi.decode(out, "uint64_t"));
+    } finally {
+      this.lib.koffi.free(out);
+    }
+  }
+
+  streamSendFrame(streamId: bigint, encodedFrame: Uint8Array, fin: boolean): void {
+    const status = this.lib.streamSendFrameFn(this.handle, streamId, encodedFrame, encodedFrame.length, fin ? 1 : 0);
+    if (status !== 0) {
+      throw new Error(`cultmesh_quic_stream_send_frame failed: ${readLastError(this.lib, this.handle)}`);
+    }
+  }
+
+  streamShutdown(streamId: bigint, code: bigint): void {
+    this.lib.streamShutdownFn(this.handle, streamId, code);
+  }
+
+  /**
+   * Isolates the faulting connection so one bad event never brings down the
+   * pump: a malformed frame, a stream-kind/delivery mismatch, or a throwing
+   * caller-supplied listener (certificate validator, waiter) faults only its
+   * own connection. The listener is removed, the connection is shut down at
+   * the native level, and `onFault` (if registered) is told, so pending and
+   * future work on that connection can reject with the error. Every other
+   * connection, and the pump itself, keep running.
+   */
+  private dispatch(event: NativeEventStruct, payload: Uint8Array): void {
+    const decoded: CultMeshQuicNativeEvent = {
+      type: event.type,
+      streamKind: event.stream_kind,
+      listenerId: event.listener_id,
+      connectionId: event.connection_id,
+      streamId: event.stream_id,
+      code: event.code,
+      status: event.status,
+      payload,
+    };
+    if (decoded.type === CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION || decoded.type === CULTMESH_QUIC_EVENT_LISTENER_STOPPED) {
+      try {
+        this.listenerListeners.get(decoded.listenerId)?.(decoded);
+      } catch (error) {
+        // No fault contract for listener-level events today; do not let a
+        // throwing handler crash the pump.
+        this.reportUnhandledDispatchError(error);
+      }
+      return;
+    }
+    const entry = this.connectionListeners.get(decoded.connectionId);
+    if (!entry) return;
+    try {
+      entry.listener(decoded);
+    } catch (error) {
+      this.faultConnection(decoded.connectionId, error instanceof Error ? error : new Error(String(error)), entry.onFault);
+    }
+  }
+
+  private faultConnection(connectionId: bigint, error: Error, onFault: NativeFaultHandler | undefined): void {
+    this.connectionListeners.delete(connectionId);
+    try {
+      this.lib.connectionShutdownFn(this.handle, connectionId, 0n);
+    } catch {
+      // Best-effort: the connection may already be gone.
+    }
+    if (onFault) {
+      try {
+        onFault(error);
+      } catch (handlerError) {
+        // The fault handler itself is caller-supplied code; a throw here
+        // must not escape into the pump any more than the original fault did.
+        this.reportUnhandledDispatchError(handlerError);
+      }
+    } else {
+      this.reportUnhandledDispatchError(error);
+    }
+  }
+
+  private reportUnhandledDispatchError(error: unknown): void {
+    // eslint-disable-next-line no-console
+    console.error("CultMesh QUIC native event dispatch failed with no fault handler registered:", error);
+  }
+
+  private async nextEvent(
+    timeoutMs: number,
+    payload: Uint8Array | null,
+    payloadCapacity: number,
+  ): Promise<{ status: number; event: NativeEventStruct | null; required: number }> {
+    // Reuses the buffers allocated once in the constructor instead of
+    // allocating fresh ones per call: the pump awaits each `nextEventAsync`
+    // before issuing the next one, so at most one call is ever in flight
+    // against them, and both are fully decoded here before the buffers can
+    // be reused by the pump's next call.
+    const status = await this.lib.nextEventAsync(
+      this.handle,
+      timeoutMs,
+      this.outEventBuffer,
+      payload,
+      payloadCapacity,
+      this.outRequiredBuffer,
+    );
+    const decoded =
+      status === 1 ? (this.lib.koffi.decode(this.outEventBuffer, this.lib.event) as NativeEventStruct) : null;
+    return {
+      status,
+      event: decoded && {
+        ...decoded,
+        listener_id: toBigInt64(decoded.listener_id),
+        connection_id: toBigInt64(decoded.connection_id),
+        stream_id: toBigInt64(decoded.stream_id),
+        code: toBigInt64(decoded.code),
+      },
+      required: this.lib.koffi.decode(this.outRequiredBuffer, "int32_t") as number,
+    };
+  }
+
+  private async pump(): Promise<void> {
+    while (!this.closed) {
+      let first: Awaited<ReturnType<CultMeshQuicNativeRuntime["nextEvent"]>>;
+      try {
+        first = await this.nextEvent(250, null, 0);
+      } catch {
+        if (this.closed) return;
+        continue;
+      }
+      if (this.closed) return;
+      if (first.status === 0 || first.status === CULTMESH_QUIC_RESULT_BAD_CALL) continue;
+      if (first.status === 1 && first.event) {
+        this.dispatch(first.event, new Uint8Array(0));
+        continue;
+      }
+      if (first.status === 2 && first.required > 0) {
+        const buffer = Buffer.alloc(first.required);
+        let second: Awaited<ReturnType<CultMeshQuicNativeRuntime["nextEvent"]>>;
+        try {
+          second = await this.nextEvent(0, buffer, buffer.length);
+        } catch {
+          if (this.closed) return;
+          continue;
+        }
+        if (second.status === 1 && second.event) {
+          this.dispatch(second.event, buffer.subarray(0, second.event.payload_length));
+        }
+        continue;
+      }
+    }
+  }
+}

packages/cultmesh-ts/src/realtime-wire.ts

@@ -0,0 +1,191 @@
+// The one TypeScript encoding of a CultMesh realtime frame.
+//
+// Rule for rule, this is `CultMeshRealtimeWireProtocol` in the C# reference
+// (`src/GameCult.Mesh/CultMeshRealtimeWireProtocol.cs`), over the frame shape
+// `CultMeshRealtimeTransports.cs` defines. QUIC stream framing stays
+// transport-owned; this file owns only the typed frame bytes and never touches
+// a socket.
+//
+// Byte parity is proven both ways, cross-process, by two committed vector files
+// under `contracts/cultmesh/`: `realtime-frame-vectors.json`, which the C# test
+// `CultMeshRealtimeWireProtocolTests` writes under CULTMESH_WRITE_VECTORS=1 and
+// this package's test decodes and re-encodes, and
+// `realtime-frame-vectors.ts-written.json`, which
+// `scripts/write-cultmesh-realtime-frame-vectors.mjs` writes with this codec and
+// the same C# test decodes. A fixture authored on one side alone would only
+// agree with itself.
+
+import { isNullOrWhiteSpaceCSharp } from "cultnet-ts";
+
+/** `CultMeshRealtimeWireProtocol.ApplicationProtocolName`: the QUIC ALPN. */
+export const CULTMESH_REALTIME_ALPN = "cultmesh-state-v1";
+
+/** `ConnectionCloseCode`: ASCII "CULT". A QUIC error code is 62-bit, so bigint. */
+export const CULTMESH_REALTIME_CONNECTION_CLOSE_CODE = 0x43554c54n;
+
+/** `StreamAbortCode`: ASCII "STAT". */
+export const CULTMESH_REALTIME_STREAM_ABORT_CODE = 0x53544154n;
+
+/** `ReliableStream`: the stream kind carrying `reliable-ordered`. */
+export const CULTMESH_REALTIME_RELIABLE_STREAM = 1;
+
+/** `LatestOnlyStream`: the stream kind carrying `latest-only`. */
+export const CULTMESH_REALTIME_LATEST_ONLY_STREAM = 2;
+
+/** `MaximumFrameBytes`: the payload ceiling, 64 MiB. */
+export const CULTMESH_REALTIME_MAX_PAYLOAD_BYTES = 64 * 1024 * 1024;
+
+/** `MaximumEncodedFrameBytes`: the payload ceiling plus the header and three maximal identities. */
+export const CULTMESH_REALTIME_MAX_ENCODED_FRAME_BYTES =
+  CULTMESH_REALTIME_MAX_PAYLOAD_BYTES + 37 + 3 * 0xffff;
+
+/**
+ * `CultMeshRealtimeDelivery`. The wire byte is the C# enum's ordinal, so the
+ * order of these three is the wire contract, not a naming choice.
+ */
+export type CultMeshRealtimeDelivery = "reliable-ordered" | "latest-only" | "unreliable";
+
+const DELIVERY_BYTES: readonly CultMeshRealtimeDelivery[] = ["reliable-ordered", "latest-only", "unreliable"];
+
+/** `CultMeshRealtimeFrame`. `producerEpoch` and `sequence` are `long` in C#, which exceeds `Number.MAX_SAFE_INTEGER`. */
+export interface CultMeshRealtimeFrame {
+  channelId: string;
+  schemaId: string;
+  bodyId: string;
+  producerEpoch: bigint;
+  sequence: bigint;
+  delivery: CultMeshRealtimeDelivery;
+  payload: Uint8Array;
+}
+
+const MAGIC = 0x31545343;
+const FIXED_HEADER_BYTES = 37;
+const WIRE_VERSION = 1;
+const MAX_IDENTITY_BYTES = 0xffff;
+const INT64_MIN = -(2n ** 63n);
+const INT64_MAX = 2n ** 63n - 1n;
+
+/**
+ * `CultMeshRealtimeFrame.Validate`. The C# reading of "non-empty" is
+ * `string.IsNullOrWhiteSpace`, whose whitespace set is not
+ * `String.prototype.trim`'s, so this borrows the one TypeScript implementation
+ * of that set from `cultnet-ts` rather than keeping a second reading here.
+ *
+ * The range check has no C# counterpart because `long` gives it for free; a
+ * `bigint` does not, and a `DataView` would otherwise throw a bare `RangeError`
+ * from inside the encoder.
+ */
+function validateFrame(frame: CultMeshRealtimeFrame): void {
+  if (isNullOrWhiteSpaceCSharp(frame.channelId)) throw new Error("Realtime channel identity is required.");
+  if (isNullOrWhiteSpaceCSharp(frame.schemaId)) throw new Error("Realtime schema identity is required.");
+  if (isNullOrWhiteSpaceCSharp(frame.bodyId)) throw new Error("Realtime body identity is required.");
+  if (frame.producerEpoch < 0n || frame.sequence < 0n) {
+    throw new Error("Realtime epoch and sequence must be non-negative.");
+  }
+  if (frame.producerEpoch > INT64_MAX || frame.sequence > INT64_MAX || frame.producerEpoch < INT64_MIN || frame.sequence < INT64_MIN) {
+    throw new Error("Realtime epoch and sequence must fit a 64-bit signed integer.");
+  }
+}
+
+/** `CultMeshRealtimeWireProtocol.EncodeFrame`. */
+export function encodeRealtimeFrame(frame: CultMeshRealtimeFrame): Uint8Array {
+  validateFrame(frame);
+  const deliveryByte = DELIVERY_BYTES.indexOf(frame.delivery);
+  // C# reads an enum, which holds any byte; a TypeScript union does not, so the
+  // unspellable value is refused here with the message decode gives it.
+  if (deliveryByte < 0) throw new Error("Realtime frame delivery mode is invalid.");
+  const encoder = new TextEncoder();
+  const channel = encoder.encode(frame.channelId);
+  const schema = encoder.encode(frame.schemaId);
+  const body = encoder.encode(frame.bodyId);
+  if (channel.byteLength > MAX_IDENTITY_BYTES || schema.byteLength > MAX_IDENTITY_BYTES || body.byteLength > MAX_IDENTITY_BYTES) {
+    throw new Error("Realtime frame identity exceeds the QUIC wire limit.");
+  }
+  if (frame.payload.byteLength > CULTMESH_REALTIME_MAX_PAYLOAD_BYTES) {
+    throw new Error("Realtime frame payload exceeds the QUIC wire limit.");
+  }
+
+  const result = new Uint8Array(
+    FIXED_HEADER_BYTES + channel.byteLength + schema.byteLength + body.byteLength + frame.payload.byteLength,
+  );
+  const view = new DataView(result.buffer);
+  view.setUint32(0, MAGIC, true);
+  result[4] = deliveryByte;
+  view.setBigInt64(5, frame.producerEpoch, true);
+  view.setBigInt64(13, frame.sequence, true);
+  view.setUint16(21, channel.byteLength, true);
+  view.setUint16(23, schema.byteLength, true);
+  view.setUint16(25, body.byteLength, true);
+  view.setInt32(27, frame.payload.byteLength, true);
+  view.setInt32(31, FIXED_HEADER_BYTES, true);
+  view.setUint16(35, WIRE_VERSION, true);
+  let offset = FIXED_HEADER_BYTES;
+  result.set(channel, offset); offset += channel.byteLength;
+  result.set(schema, offset); offset += schema.byteLength;
+  result.set(body, offset); offset += body.byteLength;
+  result.set(frame.payload, offset);
+  return result;
+}
+
+/**
+ * `CultMeshRealtimeWireProtocol.DecodeFrame`, refusal for refusal and in the
+ * same order. Like the reference, it does not call `validateFrame`: a frame
+ * whose identities are blank decodes here exactly as it does in C#, and only
+ * encoding refuses it.
+ *
+ * One corner has no C# counterpart. The reference sums the lengths under
+ * `checked`, so a payload length near `int.MaxValue` throws `OverflowException`
+ * there rather than its length refusal; JavaScript numbers do not overflow, so
+ * the sum simply fails to match and the length refusal covers that case too.
+ * No encoder on either side can produce such a frame.
+ */
+export function decodeRealtimeFrame(bytes: Uint8Array): CultMeshRealtimeFrame {
+  if (bytes.byteLength < FIXED_HEADER_BYTES) throw new Error("Realtime frame header is truncated.");
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
+  if (view.getUint32(0, true) !== MAGIC) throw new Error("Realtime frame magic is invalid.");
+  if (view.getUint16(35, true) !== WIRE_VERSION || view.getInt32(31, true) !== FIXED_HEADER_BYTES) {
+    throw new Error("Realtime frame wire version is unsupported.");
+  }
+  const delivery = DELIVERY_BYTES[bytes[4]!];
+  if (delivery === undefined) throw new Error("Realtime frame delivery mode is invalid.");
+  const channelLength = view.getUint16(21, true);
+  const schemaLength = view.getUint16(23, true);
+  const bodyLength = view.getUint16(25, true);
+  const payloadLength = view.getInt32(27, true);
+  const expected = FIXED_HEADER_BYTES + channelLength + schemaLength + bodyLength + payloadLength;
+  if (payloadLength < 0 || expected !== bytes.byteLength) throw new Error("Realtime frame length is invalid.");
+  // `Encoding.UTF8.GetString` substitutes U+FFFD for invalid bytes rather than
+  // throwing, which is what a non-fatal `TextDecoder` does. `ignoreBOM` is not
+  // cosmetic: by default `TextDecoder` *deletes* a leading U+FEFF, and
+  // `GetString` keeps it, so an identity starting with a byte-order mark would
+  // decode to a different string on the two sides. U+FEFF is not whitespace to
+  // .NET either, so such an identity passes the transport contract and reaches
+  // the wire.
+  const decoder = new TextDecoder("utf-8", { ignoreBOM: true });
+  let offset = FIXED_HEADER_BYTES;
+  const channelId = decoder.decode(bytes.subarray(offset, offset + channelLength)); offset += channelLength;
+  const schemaId = decoder.decode(bytes.subarray(offset, offset + schemaLength)); offset += schemaLength;
+  const bodyId = decoder.decode(bytes.subarray(offset, offset + bodyLength)); offset += bodyLength;
+  return {
+    channelId,
+    schemaId,
+    bodyId,
+    producerEpoch: view.getBigInt64(5, true),
+    sequence: view.getBigInt64(13, true),
+    delivery,
+    // Not `bytes.slice(...)`. Node's `Buffer` overrides `slice` with an alias of
+    // `subarray`, so on a `Buffer` — which is what every socket read hands a Node
+    // caller — that spelling returns a *view* of the frame, and a decoded payload
+    // that changes when the frame buffer is reused.
+    //
+    // Nor `Uint8Array.prototype.slice.call(bytes, ...)`, which does bypass the
+    // override and copy, but takes its result constructor from `@@species`: on a
+    // `Buffer` that is `FastBuffer`, so the payload comes back a `Buffer` from a
+    // `Buffer` frame and a `Uint8Array` from a `Uint8Array` one. The declared
+    // type holds either way, but `deepStrictEqual` does not, so the same frame
+    // would compare equal or not depending on how it reached the decoder.
+    //
+    // The constructor copies and is the one type on both inputs.
+    payload: new Uint8Array(bytes.subarray(offset, offset + payloadLength)),
+  };
+}

packages/cultmesh-ts/test/cultmesh.test.ts

@@ -2500,16 +2500,20 @@ test("CultMesh TS branded facade exposes schema and shard catalogs", () => {
 
   const builtIns = CultMesh.createBuiltInSchemaCatalog();
   assert.equal(
-    builtIns.get("cultnet.shard_catalog_request.v0")?.schemaVersion,
+    builtIns.get(
+      "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.shard-catalog-request.schema.json",
+    )?.schemaVersion,
     "cultnet.shard_catalog_request.v0",
   );
   assert.equal(
-    builtIns.get("cultnet.shard_catalog_response.v0")?.kind,
+    builtIns.get(
+      "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.shard-catalog-response.schema.json",
+    )?.kind,
     "wire_message",
   );
   assert.equal(
     builtIns.get(
-      "https://github.com/GameCult/cultnet-ts/contracts/cultnet.transport-profile.schema.json",
+      "https://github.com/GameCult/CultLib/contracts/cultnet/cultnet.transport-profile.schema.json",
     )?.schemaVersion,
     "cultnet.transport_profile.v0",
   );

packages/cultmesh-ts/test/fixtures/README.md

@@ -0,0 +1,27 @@
+# QUIC test fixtures
+
+`quic-test.p12` and `quic-test-cert.der` are a self-signed P-256 credential
+used only to open a loopback MsQuic listener in tests
+(`realtime-quic-native.test.ts`, `realtime-quic-consumer.test.ts`). Not a
+production credential; no private key outside this pair signs anything real.
+
+`quic-test-cert.der`'s subject is `CN=cultmesh-quic-native-tests`, and its
+SHA-256 is what the tests pin as the expected certificate pin
+(`cert-sha256`).
+
+Generated with (mirrors the recipe the cut map records at P13):
+
+```sh
+openssl req -x509 -newkey ec -pkeyopt ec_paramgen_curve:P-256 -nodes \
+  -keyout quic-test-key.pem -out quic-test-cert.pem \
+  -subj "/CN=cultmesh-quic-native-tests" -days 3650
+
+openssl x509 -in quic-test-cert.pem -outform der -out quic-test-cert.der
+
+openssl pkcs12 -export -inkey quic-test-key.pem -in quic-test-cert.pem \
+  -out quic-test.p12 -passout pass:
+```
+
+Regenerate the same way if the pair ever needs replacing; nothing here
+depends on today's exact bytes past what the tests read back out (the DER
+cert and its SHA-256, and a PKCS12 the native bridge can load).

packages/cultmesh-ts/test/interop/cultmesh-quic-peer.ts

@@ -0,0 +1,234 @@
+// The TypeScript half of the QUIC realtime interop lane. Two modes:
+//
+// `dial` (Cut 4): a one-shot process that dials an advertised
+// `cultmesh-state+quic://` endpoint with the native connector, receives
+// `--expect` frames from a peer (normally the C# managed provider started by
+// `cultnet-interop.test.ts`'s "CultMesh QUIC realtime" test), and prints them
+// as one JSON line.
+//
+// `serve` (Cut 5): the StreamPixels role. Opens a `CultMeshQuicRealtimeProvider`
+// listener, prints `{status: "ready", endpoint}` (the same shape the C#
+// `quic-realtime-serve` peer prints), waits for a first peer before
+// broadcasting (mirroring `QuicRealtimeServeAsync`'s
+// `WaitForFirstConnectionAsync`, since a broadcast to nobody would otherwise
+// silently no-op), then broadcasts `--frames` frames at `--delivery` with
+// `--interval-ms` between them, watching stdin for EOF as its own shutdown
+// signal like the C# peer's `WatchStdinCloseAsync`. `--linger-ms` (default 0)
+// keeps the listener open that long after broadcasting finishes, so the
+// harness can dial a peer late and exercise Cut C's retained-state seed
+// instead of the provider always tearing down the moment it is done sending.
+//
+// Neither mode imports `cultmesh-ts` itself (the harness drives processes,
+// and the dependency direction is `cultmesh-ts` -> `cultnet-ts`, never the
+// reverse); this script reaches the provider/connector through its own
+// package's `src/`.
+
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+import process from "node:process";
+
+import {
+  CultMeshQuicRealtimeConnector,
+  CultMeshQuicRealtimeProvider,
+  type CultMeshRealtimeTarget,
+} from "../../src/realtime-quic";
+import { encodeRealtimeFrame, type CultMeshRealtimeDelivery, type CultMeshRealtimeFrame } from "../../src/realtime-wire";
+
+// `__dirname` at runtime is `dist-test/test/interop`; fixtures are binary and
+// are never compiled/copied there, so they are read from their source
+// location, three levels up. The same self-signed test credential the unit
+// tests use (`test/fixtures/README.md`): not a production credential.
+const FIXTURE_P12 = join(__dirname, "..", "..", "..", "test", "fixtures", "quic-test.p12");
+
+function parseArgs(argv: readonly string[]): Map<string, string> {
+  const args = new Map<string, string>();
+  for (let index = 0; index < argv.length; index += 1) {
+    const token = argv[index];
+    if (!token.startsWith("--")) continue;
+    const name = token.slice(2);
+    const value = argv[index + 1];
+    if (!value || value.startsWith("--")) throw new Error(`Missing value for --${name}`);
+    args.set(name, value);
+    index += 1;
+  }
+  return args;
+}
+
+function requireArg(args: Map<string, string>, name: string): string {
+  const value = args.get(name);
+  if (!value) throw new Error(`Missing required argument --${name}`);
+  return value;
+}
+
+function optionalIntArg(args: Map<string, string>, name: string, fallback: number): number {
+  const raw = args.get(name);
+  if (!raw) return fallback;
+  const parsed = Number.parseInt(raw, 10);
+  if (!Number.isInteger(parsed)) throw new Error(`Argument --${name} must be an integer.`);
+  return parsed;
+}
+
+function writeJsonLine(value: unknown): void {
+  process.stdout.write(`${JSON.stringify(value)}\n`);
+}
+
+function writeLog(event: string, payload: Record<string, unknown>): void {
+  process.stderr.write(`${JSON.stringify({ event, ...payload })}\n`);
+}
+
+function watchStdinCloseAsync(): Promise<void> {
+  return new Promise((resolve) => {
+    process.stdin.resume();
+    process.stdin.once("end", resolve);
+  });
+}
+
+async function serveAsync(args: Map<string, string>): Promise<void> {
+  const frames = optionalIntArg(args, "frames", 5);
+  const deliveryArg = args.get("delivery") ?? "latest-only";
+  if (deliveryArg !== "latest-only" && deliveryArg !== "reliable-ordered") {
+    throw new Error(`Unsupported --delivery '${deliveryArg}'.`);
+  }
+  const delivery = deliveryArg as CultMeshRealtimeDelivery;
+  const intervalMs = optionalIntArg(args, "interval-ms", 50);
+  const lingerMs = optionalIntArg(args, "linger-ms", 0);
+  const port = optionalIntArg(args, "port", 0);
+
+  const provider = await CultMeshQuicRealtimeProvider.listen({
+    host: "127.0.0.1",
+    port,
+    serverCertificate: { pkcs12: readFileSync(FIXTURE_P12), password: "" },
+  });
+  writeJsonLine({ status: "ready", endpoint: provider.advertisedEndpoint });
+
+  try {
+    // A broadcast to zero peers is not an error, but it sends nothing:
+    // matching the C# `quic-realtime-serve` peer, wait for a first
+    // connection, bounded, so a peer that never shows up still exits.
+    const connectDeadline = Date.now() + 30_000;
+    while (provider.connectionCount === 0) {
+      if (Date.now() >= connectDeadline) throw new Error("quic-realtime-serve: no client connected within 30000ms.");
+      await new Promise((resolve) => setTimeout(resolve, 20));
+    }
+
+    const stdinClosed = watchStdinCloseAsync();
+    let stopped = false;
+    void stdinClosed.then(() => {
+      stopped = true;
+    });
+    for (let sequence = 1; sequence <= frames && !stopped; sequence += 1) {
+      const frame: CultMeshRealtimeFrame = {
+        channelId: "interop.quic-realtime",
+        schemaId: "gamecult.interop.quic_realtime_frame.v0",
+        bodyId: "interop:quic-realtime:frame",
+        producerEpoch: 1n,
+        sequence: BigInt(sequence),
+        delivery,
+        payload: Buffer.from(`frame-${sequence}`, "utf8"),
+      };
+      await provider.broadcast(frame);
+      // Printed so the harness can compare this exact frame's TypeScript
+      // encoding against the same frame's C#-side re-encoding (golden bytes
+      // across processes), without the harness importing the codec itself.
+      writeLog("quic-realtime-serve", { sent: sequence, hex: Buffer.from(encodeRealtimeFrame(frame)).toString("hex") });
+      if (intervalMs > 0) await new Promise((resolve) => setTimeout(resolve, intervalMs));
+    }
+    if (lingerMs > 0 && !stopped) await new Promise((resolve) => setTimeout(resolve, lingerMs));
+  } finally {
+    provider.dispose();
+    // Mirrors the C# peer returning from `QuicRealtimeServeAsync`: once
+    // broadcasting is done (or stdin closed early), let the process exit on
+    // its own instead of keeping the event loop alive on a stdin that may
+    // never close. The harness still ends/kills this process explicitly in
+    // its own cleanup; this only lets a plain manual run exit cleanly too.
+    process.stdin.pause();
+  }
+}
+
+async function main(): Promise<void> {
+  const [mode, ...rest] = process.argv.slice(2);
+  if (mode === "serve") {
+    await serveAsync(parseArgs(rest));
+    return;
+  }
+  if (mode !== "dial") throw new Error("Expected mode: dial | serve");
+  const args = parseArgs(rest);
+  const endpoint = requireArg(args, "endpoint");
+  const expect = optionalIntArg(args, "expect", 1);
+  // Alternative stop condition to --expect: keep receiving (through whatever
+  // the consumer's own coalescing inbox delivers) until a frame with this
+  // sequence arrives, then stop. Lets a caller prove convergence under
+  // latest-only coalescing, where the frame *count* a stalled reader sees is
+  // not the interesting number, but the final value it converges on is.
+  const expectSequenceRaw = args.get("expect-sequence");
+  const expectSequence = expectSequenceRaw !== undefined ? BigInt(expectSequenceRaw) : undefined;
+  const timeoutMs = optionalIntArg(args, "timeout-ms", 15_000);
+  // Simulates "a test hook on the runtime that stops calling next_event"
+  // (spec section 10, LatestOnly-under-a-stalled-consumer lane) at the level
+  // this subprocess can reach: after receiving --pause-after frames, stop
+  // calling receiveFrame for --pause-ms. The shared native pump keeps
+  // dispatching and coalescing into this transport's own inbox regardless
+  // (Cut 4), so not reading is externally equivalent to not polling.
+  const pauseAfter = optionalIntArg(args, "pause-after", -1);
+  const pauseMs = optionalIntArg(args, "pause-ms", 0);
+
+  const target: CultMeshRealtimeTarget = { verseId: "interop", authorityRuntimeId: "interop.csharp-provider" };
+  const connector = new CultMeshQuicRealtimeConnector();
+  const transport = await connector.connect(
+    { endpoint, authorityRuntimeId: target.authorityRuntimeId, priority: 0, generation: "interop" },
+    target,
+  );
+  writeLog("connected", { endpoint, transportId: transport.transportId });
+
+  const frames: Array<{
+    channelId: string;
+    schemaId: string;
+    bodyId: string;
+    producerEpoch: string;
+    sequence: string;
+    delivery: string;
+    payloadHex: string;
+  }> = [];
+  try {
+    const deadline = Date.now() + timeoutMs;
+    let lastSequence: bigint | undefined;
+    while (
+      (expectSequence === undefined && frames.length < expect) ||
+      (expectSequence !== undefined && lastSequence !== expectSequence)
+    ) {
+      if (pauseAfter >= 0 && frames.length === pauseAfter) {
+        writeLog("pausing", { afterFrames: frames.length, pauseMs });
+        await new Promise((resolve) => setTimeout(resolve, pauseMs));
+        writeLog("resumed", { afterFrames: frames.length });
+      }
+      const remaining = deadline - Date.now();
+      if (remaining <= 0) throw new Error(`Timed out after receiving ${frames.length} frames (last sequence ${lastSequence}).`);
+      const controller = new AbortController();
+      const timer = setTimeout(() => controller.abort(), remaining);
+      try {
+        const frame = await transport.receiveFrame(controller.signal);
+        lastSequence = frame.sequence;
+        frames.push({
+          channelId: frame.channelId,
+          schemaId: frame.schemaId,
+          bodyId: frame.bodyId,
+          producerEpoch: frame.producerEpoch.toString(),
+          sequence: frame.sequence.toString(),
+          delivery: frame.delivery,
+          payloadHex: Buffer.from(frame.payload).toString("hex"),
+        });
+      } finally {
+        clearTimeout(timer);
+      }
+    }
+  } finally {
+    transport.dispose();
+  }
+
+  writeJsonLine({ endpoint, transportId: transport.transportId, frames });
+}
+
+main().catch((error) => {
+  writeLog("fatal", { error: error instanceof Error ? (error.stack ?? error.message) : String(error) });
+  process.exitCode = 1;
+});

packages/cultmesh-ts/test/realtime-quic-native.test.ts

@@ -0,0 +1,388 @@
+// The Cut 3 FFI smoke, now run against `CultMeshQuicNativeRuntime` instead of
+// raw koffi calls: open a runtime, open a listener with a real credential,
+// connect a real loopback connection, exchange one frame's worth of raw
+// bytes, and close everything down. This proves the binding's declared ABI
+// matches the shipped bridge; frame semantics (delivery, generation) are
+// `realtime-quic-consumer.test.ts`'s job.
+//
+// Skips instead of failing when no native bridge is available: set
+// CULTMESH_QUIC_NATIVE_DIR to a directory `scripts/build-quic-native.ps1` or
+// `scripts/build-quic-native.sh` built, or run from the committed
+// `packages/cultmesh-ts/native/<platform>` tree once a later cut lands it.
+
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+import test from "node:test";
+
+import {
+  CultMeshQuicNativeRuntime,
+  CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION,
+  CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED,
+  CULTMESH_QUIC_EVENT_CONNECTION_CONNECTED,
+  CULTMESH_QUIC_EVENT_CONNECTION_SHUTDOWN,
+  CULTMESH_QUIC_EVENT_STREAM_STARTED,
+  CULTMESH_QUIC_EVENT_STREAM_FRAME,
+  CULTMESH_QUIC_EVENT_STREAM_SEND_COMPLETE,
+  CULTMESH_QUIC_STREAM_RELIABLE,
+} from "../src/realtime-quic-native";
+import { nativeBridgeAvailable } from "./support/native-bridge";
+
+// __dirname at runtime is dist-test/test; fixtures are binary and are never
+// compiled/copied there, so they are read from their source location, two
+// levels up.
+const FIXTURE_P12 = join(__dirname, "..", "..", "test", "fixtures", "quic-test.p12");
+
+async function waitFor<T>(collect: (resolve: (value: T) => void) => void, timeoutMs = 5_000): Promise<T> {
+  return await new Promise<T>((resolve, reject) => {
+    const timer = setTimeout(() => reject(new Error("timed out waiting for a native QUIC event")), timeoutMs);
+    collect((value) => {
+      clearTimeout(timer);
+      resolve(value);
+    });
+  });
+}
+
+test("CultMeshQuicNativeRuntime opens and closes with no listener or connection", async (t) => {
+  if (!nativeBridgeAvailable()) {
+    t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+    return;
+  }
+  const runtime = await CultMeshQuicNativeRuntime.open();
+  await runtime.release();
+});
+
+test("CultMeshQuicNativeRuntime opens and closes a listener with a real PKCS12 credential", async (t) => {
+  if (!nativeBridgeAvailable()) {
+    t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+    return;
+  }
+  const runtime = await CultMeshQuicNativeRuntime.open();
+  try {
+    const pkcs12 = readFileSync(FIXTURE_P12);
+    const { listenerId, boundPort } = runtime.listenerOpen("127.0.0.1", 0, pkcs12, "");
+    assert.ok(boundPort > 0);
+    runtime.listenerClose(listenerId);
+  } finally {
+    await runtime.release();
+  }
+});
+
+test("a full loopback connection delivers one raw frame end to end", async (t) => {
+  if (!nativeBridgeAvailable()) {
+    t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+    return;
+  }
+  const runtime = await CultMeshQuicNativeRuntime.open();
+  try {
+    const pkcs12 = readFileSync(FIXTURE_P12);
+    const { listenerId, boundPort } = runtime.listenerOpen("127.0.0.1", 0, pkcs12, "");
+
+    const accepted = waitFor<bigint>((resolve) => {
+      runtime.onListenerEvent(listenerId, (event) => {
+        if (event.type === CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION) resolve(event.connectionId);
+      });
+    });
+
+    const clientConnectionId = runtime.connectionOpen("127.0.0.1", boundPort);
+    const clientConnected = waitFor<void>((resolve) => {
+      runtime.onConnectionEvent(clientConnectionId, (event) => {
+        if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED) {
+          runtime.connectionCertificateComplete(clientConnectionId, true);
+          return;
+        }
+        if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CONNECTED) resolve();
+      });
+    });
+
+    const serverConnectionId = await accepted;
+    const serverFrame = waitFor<Uint8Array>((resolve) => {
+      runtime.onConnectionEvent(serverConnectionId, (event) => {
+        if (event.type === CULTMESH_QUIC_EVENT_STREAM_STARTED) {
+          assert.equal(event.streamKind, CULTMESH_QUIC_STREAM_RELIABLE);
+          return;
+        }
+        if (event.type === CULTMESH_QUIC_EVENT_STREAM_FRAME) resolve(event.payload);
+      });
+    });
+
+    await clientConnected;
+    const streamId = runtime.streamOpen(clientConnectionId, CULTMESH_QUIC_STREAM_RELIABLE);
+    const sendComplete = waitFor<void>((resolve) => {
+      runtime.onConnectionEvent(clientConnectionId, (event) => {
+        if (event.type === CULTMESH_QUIC_EVENT_STREAM_SEND_COMPLETE) resolve();
+      });
+    });
+    runtime.streamSendFrame(streamId, new Uint8Array([1, 2, 3, 4]), true);
+    await sendComplete;
+
+    const payload = await serverFrame;
+    assert.deepEqual(Array.from(payload), [1, 2, 3, 4]);
+
+    runtime.connectionShutdown(clientConnectionId, 0n);
+    runtime.connectionShutdown(serverConnectionId, 0n);
+    runtime.listenerClose(listenerId);
+  } finally {
+    await runtime.release();
+  }
+});
+
+test("F7: a 64-bit event code round-trips exactly through the struct decode", async (t) => {
+  if (!nativeBridgeAvailable()) {
+    t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+    return;
+  }
+  const runtime = await CultMeshQuicNativeRuntime.open();
+  try {
+    const pkcs12 = readFileSync(FIXTURE_P12);
+    const { listenerId, boundPort } = runtime.listenerOpen("127.0.0.1", 0, pkcs12, "");
+
+    // `code` (a `uint64_t`, the same field `CULTMESH_QUIC_SEND_CANCELED` is
+    // compared against on the stream-send path) is exercised here through
+    // CONNECTION_SHUTDOWN instead, whose code is an application-chosen value
+    // this test fully controls: two values above 2^53 (where koffi's decode
+    // stops being a plain safe-integer `number`) prove the whole
+    // encode-native-decode-coerce path is exact, deterministically, with no
+    // dependency on MsQuic's own send-completion timing.
+    for (const code of [(1n << 53n) + 1n, (1n << 62n) - 1n]) {
+      const accepted = waitFor<bigint>((resolve) => {
+        runtime.onListenerEvent(listenerId, (event) => {
+          if (event.type === CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION) resolve(event.connectionId);
+        });
+      });
+      const clientConnectionId = runtime.connectionOpen("127.0.0.1", boundPort);
+      const clientConnected = waitFor<void>((resolve) => {
+        runtime.onConnectionEvent(clientConnectionId, (event) => {
+          if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED) {
+            runtime.connectionCertificateComplete(clientConnectionId, true);
+            return;
+          }
+          if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CONNECTED) resolve();
+        });
+      });
+      const serverConnectionId = await accepted;
+      await clientConnected;
+
+      const seenOnClient = waitFor<bigint>((resolve) => {
+        runtime.onConnectionEvent(clientConnectionId, (event) => {
+          if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_SHUTDOWN) resolve(event.code);
+        });
+      });
+      runtime.connectionShutdown(serverConnectionId, code);
+      const seen = await seenOnClient;
+      assert.equal(typeof seen, "bigint", "a decoded event code must always be bigint, never number");
+      assert.equal(seen, code, `shutdown code ${code} must round-trip exactly through the struct decode`);
+    }
+
+    runtime.listenerClose(listenerId);
+  } finally {
+    await runtime.release();
+  }
+});
+
+test(
+  "P10b: a throwing onFault handler is isolated — the pump survives and other connections' handlers still run",
+  { timeout: 10_000 },
+  async (t) => {
+    if (!nativeBridgeAvailable()) {
+      t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+      return;
+    }
+    const runtime = await CultMeshQuicNativeRuntime.open();
+    try {
+      const pkcs12 = readFileSync(FIXTURE_P12);
+      const { listenerId, boundPort } = runtime.listenerOpen("127.0.0.1", 0, pkcs12, "");
+
+      // Connection B: a normal, fully connected loopback pair, established
+      // before A ever faults — so proving B still works afterward exercises
+      // an already-running connection's handler, not a second accept cycle
+      // racing whatever state A's fault left behind.
+      const acceptedB = waitFor<bigint>((resolve) => {
+        runtime.onListenerEvent(listenerId, (event) => {
+          if (event.type === CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION) resolve(event.connectionId);
+        });
+      });
+      const clientB = runtime.connectionOpen("127.0.0.1", boundPort);
+      const clientBConnected = waitFor<void>((resolve) => {
+        runtime.onConnectionEvent(clientB, (event) => {
+          if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED) {
+            runtime.connectionCertificateComplete(clientB, true);
+            return;
+          }
+          if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CONNECTED) resolve();
+        });
+      });
+      const serverBId = await acceptedB;
+      const serverBFrame = waitFor<Uint8Array>((resolve) => {
+        runtime.onConnectionEvent(serverBId, (event) => {
+          if (event.type === CULTMESH_QUIC_EVENT_STREAM_FRAME) resolve(event.payload);
+        });
+      });
+      await clientBConnected;
+
+      // Connection A, opened only after B is fully connected: both its
+      // listener and its onFault handler throw on the first event delivered
+      // to it. Without `faultConnection`'s own try/catch isolating a
+      // throwing `onFault` (P10b's target), that throw would escape the
+      // pump's dispatch loop and take every other connection — including
+      // the already-live B — down with it, instead of staying scoped to A.
+      //
+      // The server-side connection listener is registered synchronously,
+      // inside the LISTENER_NEW_CONNECTION callback itself, rather than
+      // after an `await`: the native bridge can dispatch a connection's next
+      // event (CERTIFICATE_RECEIVED, or CONNECTED) before a later `await`'s
+      // continuation ever runs, and an event with no listener registered for
+      // its connection id is silently dropped (`dispatch`'s own
+      // `if (!entry) return`) — the same async-registration gap fix 1 closed
+      // for the provider's own accept path.
+      const serverAFaulted = waitFor<void>((resolve) => {
+        runtime.onListenerEvent(listenerId, (event) => {
+          if (event.type !== CULTMESH_QUIC_EVENT_LISTENER_NEW_CONNECTION) return;
+          runtime.onConnectionEvent(
+            event.connectionId,
+            () => {
+              throw new Error("P10b: connection A's listener always throws.");
+            },
+            () => {
+              resolve();
+              throw new Error("P10b: connection A's onFault also throws.");
+            },
+          );
+        });
+      });
+      const clientA = runtime.connectionOpen("127.0.0.1", boundPort);
+      runtime.onConnectionEvent(clientA, (event) => {
+        if (event.type === CULTMESH_QUIC_EVENT_CONNECTION_CERTIFICATE_RECEIVED) {
+          runtime.connectionCertificateComplete(clientA, true);
+        }
+      });
+      await serverAFaulted;
+
+      // Prove B's handler is still live after A's onFault threw: send a
+      // frame on B and confirm the server side still receives it.
+      const streamId = runtime.streamOpen(clientB, CULTMESH_QUIC_STREAM_RELIABLE);
+      runtime.streamSendFrame(streamId, new Uint8Array([9, 9, 9]), true);
+      const payload = await serverBFrame;
+      assert.deepEqual(
+        Array.from(payload),
+        [9, 9, 9],
+        "connection B must still deliver frames after A's onFault threw",
+      );
+
+      runtime.connectionShutdown(clientA, 0n);
+      runtime.connectionShutdown(clientB, 0n);
+      runtime.connectionShutdown(serverBId, 0n);
+      runtime.listenerClose(listenerId);
+    } finally {
+      await runtime.release();
+    }
+  },
+);
+
+test("fix 2: release() refuses a call with no outstanding reference", async (t) => {
+  if (!nativeBridgeAvailable()) {
+    t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+    return;
+  }
+  const runtime = await CultMeshQuicNativeRuntime.open();
+  await runtime.release();
+  await assert.rejects(runtime.release(), /no outstanding reference/i);
+});
+
+test("negative grep: no koffi callbacks, .async only on nextEvent", () => {
+  // __dirname at runtime is dist-test/test; the source lives two levels up,
+  // in src/, since only .js output is mirrored under dist-test.
+  const source = readFileSync(join(__dirname, "..", "..", "src", "realtime-quic-native.ts"), "utf8");
+  // `.async` is referenced (not necessarily called with a literal "(" at the
+  // reference site: it is handed to `promisify`, which calls it) only for
+  // `nextEvent`, the ABI's single blocking export.
+  const asyncUses = [...source.matchAll(/\.async\b/g)];
+  assert.ok(asyncUses.length > 0, "expected at least one .async use for nextEvent");
+  for (const match of asyncUses) {
+    const before = source.slice(Math.max(0, match.index! - 40), match.index!);
+    assert.match(before, /nextEvent/i, "the only .async reference must be nextEvent");
+  }
+  assert.doesNotMatch(source, /koffi\.register/, "no koffi callbacks");
+});
+
+// The measurement below runs in its own `node --expose-gc` child process
+// instead of in this test's own process: by the time this test would run,
+// ~150 earlier tests in the suite have already grown and partly freed the
+// glibc heap, so a real per-call native leak can land in already-mapped free
+// space and never show up as RSS growth in *this* process (confirmed by hand:
+// the in-process version of this test passed even with `nextEvent` mutated
+// back to allocating fresh koffi buffers every call). A freshly spawned
+// process has no such history, matching the ~8 MiB (fixed) vs ~30 MiB
+// (pre-fix) split measured in isolation.
+const MEMORY_PROBE_SCRIPT = `
+const { CultMeshQuicNativeRuntime } = require(process.argv[1]);
+(async () => {
+  const runtime = await CultMeshQuicNativeRuntime.open();
+  const nextEvent = runtime.nextEvent.bind(runtime);
+  try {
+    for (let i = 0; i < 2000; i += 1) await nextEvent(0, null, 0);
+    global.gc();
+    const before = process.memoryUsage().rss;
+    const ITERATIONS = 200000;
+    for (let i = 0; i < ITERATIONS; i += 1) await nextEvent(0, null, 0);
+    global.gc();
+    const after = process.memoryUsage().rss;
+    process.stdout.write(JSON.stringify({ before, after, growthBytes: after - before, ITERATIONS }));
+  } finally {
+    await runtime.release();
+  }
+})().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});
+`;
+
+test(
+  "memory: sustained nextEvent calls do not leak koffi-allocated out-parameter buffers",
+  { timeout: 60_000 },
+  (t) => {
+    if (!nativeBridgeAvailable()) {
+      t.skip("CULTMESH_QUIC_NATIVE_DIR is not set to a built native bridge.");
+      return;
+    }
+
+    // `nextEvent` is private; the compiled module path is resolved the same
+    // way this file's own `import` resolves it, and handed to the child by
+    // argv so the child needs no path logic of its own.
+    const modulePath = require.resolve("../src/realtime-quic-native");
+    const result = spawnSync(process.execPath, ["--expose-gc", "-e", MEMORY_PROBE_SCRIPT, modulePath], {
+      encoding: "utf8",
+      env: process.env,
+    });
+    if (result.status !== 0 || typeof result.stdout !== "string" || result.stdout.trim().length === 0) {
+      if (/--expose-gc/.test(result.stderr ?? "")) {
+        t.skip("this Node build does not support --expose-gc.");
+        return;
+      }
+      assert.fail(
+        `memory probe child process failed (status ${String(result.status)}):\n${result.stderr ?? "(no stderr)"}`,
+      );
+    }
+
+    const { before, after, growthBytes, ITERATIONS } = JSON.parse(result.stdout.trim()) as {
+      before: number;
+      after: number;
+      growthBytes: number;
+      ITERATIONS: number;
+    };
+    // Measured on Yggdrasil, same build and host, in a dedicated process:
+    // fixed code (0 `koffi.alloc` calls in the loop): ~8.0 MiB RSS growth.
+    // pre-fix code (400k `koffi.alloc` calls, never freed): ~29.9 MiB.
+    // 18 MiB sits well above the fixed baseline and well below the leaking
+    // one, so the bound stays robust to ordinary run-to-run noise while
+    // still catching the regression.
+    const BOUND_BYTES = 18 * 1024 * 1024;
+    assert.ok(
+      growthBytes < BOUND_BYTES,
+      `RSS grew by ${growthBytes} bytes (${(growthBytes / 1024 / 1024).toFixed(2)} MiB, from ${before} to ${after}) ` +
+        `over ${ITERATIONS} nextEvent calls; expected it to stay under ${BOUND_BYTES / 1024 / 1024} MiB once ` +
+        "out-parameter buffers are reused instead of allocated per call.",
+    );
+  },
+);

packages/cultmesh-ts/test/realtime-quic-release-uaf.test.ts

@@ -0,0 +1,43 @@
+// Regression test for fix 2: CultMeshQuicNativeRuntime.release() must await
+// the pump loop's exit before calling cultmesh_quic_runtime_close, never
+// after. Reverting that order (close before awaiting the pump) reliably
+// crashes this test under a saturated libuv thread pool and MALLOC_PERTURB_,
+// at every pool size tried by hand while verifying this batch; restored
+// immediately afterward, never committed.
+//
+// UV_THREADPOOL_SIZE and MALLOC_PERTURB_ must be set before Node starts, so
+// this spawns a child `node` process running test/support/release-uaf-probe.js
+// with that environment, once per pool size, and asserts it exits 0. Kept to
+// one scenario (see the probe's own header) so the whole test stays bounded
+// to a few seconds.
+
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import { join } from "node:path";
+import test from "node:test";
+
+import { nativeBridgeAvailable } from "./support/native-bridge";
+
+const PROBE_SCRIPT = join(__dirname, "..", "..", "test", "support", "release-uaf-probe.js");
+
+test("fix 2 regression: release()'s ordering survives a saturated thread pool at pool sizes 1, 2 and 4", async (t) => {
+  if (!nativeBridgeAvailable()) return void t.skip("no native bridge available");
+
+  for (const poolSize of [1, 2, 4]) {
+    const result = spawnSync(process.execPath, [PROBE_SCRIPT], {
+      env: {
+        ...process.env,
+        UV_THREADPOOL_SIZE: String(poolSize),
+        MALLOC_PERTURB_: "165",
+      },
+      encoding: "utf8",
+      timeout: 60_000,
+    });
+    assert.equal(
+      result.status,
+      0,
+      `pool size ${poolSize}: probe exited status=${result.status} signal=${result.signal}\n` +
+        `stdout:\n${result.stdout}\nstderr:\n${result.stderr}`,
+    );
+  }
+});

packages/cultmesh-ts/test/realtime-quic-session-manager.test.ts

@@ -0,0 +1,358 @@
+// `CultMeshQuicRealtimeSessionManager`'s own rules, isolated from the native
+// bridge with fake connectors/transports: eviction on transport death (fix
+// 4), single-flight (fix 4), the disposed guard (fix 4), first-success racing
+// with abort of the losers (fix 5), the `protocolIds` filter (M7), the
+// `authorityRuntimeId` filter (M8), the session key including
+// `authorityRuntimeId` (M9), and the `maxRacedCandidates` cap (M6).
+//
+// Routes use `trust.mode = "local-development"` over loopback endpoints, so
+// `verifyAuthorityRoute` short-circuits without a signed certificate
+// (`cultmesh-authority.ts:99`): these tests are about the session manager's
+// own binding/racing/caching rules, not route trust, which
+// `realtime-quic-consumer.test.ts`'s trust negatives already pin.
+
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import type { CultMeshAuthorityTrustPolicy } from "cultnet-ts";
+import type { CultMeshAuthorityRouteMessage, CultMeshVerseDescriptorMessage } from "cultnet-ts/contracts";
+
+import {
+  CultMeshQuicRealtimeSessionManager,
+  CultMeshStaticRealtimeLookupSource,
+  CULTMESH_REALTIME_STATE_PROTOCOL_ID,
+  type CultMeshRealtimeCandidate,
+  type CultMeshRealtimeTarget,
+  type CultMeshRealtimeTransport,
+  type CultMeshRealtimeTransportConnector,
+} from "../src/realtime-quic";
+
+const trust: CultMeshAuthorityTrustPolicy = { mode: "local-development", odinRoots: [] };
+
+function route(overrides: Partial<CultMeshAuthorityRouteMessage> = {}): CultMeshAuthorityRouteMessage {
+  return {
+    authorityRuntimeId: "service:aetheria.daemon",
+    endpoint: "cultmesh-state+quic://127.0.0.1:9443",
+    protocolIds: [CULTMESH_REALTIME_STATE_PROTOCOL_ID],
+    priority: 0,
+    generation: "gen-1",
+    ...overrides,
+  };
+}
+
+function verseWithRoutes(verseId: string, routes: readonly CultMeshAuthorityRouteMessage[]): CultMeshVerseDescriptorMessage {
+  return {
+    verseId,
+    displayName: verseId,
+    authorityModel: "operator-cluster",
+    compatibility: { transportVersion: "cultmesh.v1", rulesHash: "test", compatibleVerseIds: [], requiredPluginIds: [], optionalPluginIds: [] },
+    discoveryEndpoints: routes.map((r) => r.endpoint),
+    authorityRuntimeIds: [...new Set(routes.map((r) => r.authorityRuntimeId))],
+    authorityRoutes: [...routes],
+  };
+}
+
+interface FakeTransportHandle {
+  readonly transport: CultMeshRealtimeTransport;
+  disposed(): boolean;
+}
+
+/** A transport that never resolves `receiveFrame` and tracks its own disposal. */
+function fakeTransport(endpoint: string, verified = true): FakeTransportHandle {
+  let disposed = false;
+  const disposalHandlers: Array<() => void> = [];
+  const transport: CultMeshRealtimeTransport = {
+    transportId: "fake",
+    endpoint,
+    async sendFrame() {},
+    async receiveFrame() {
+      return await new Promise<never>(() => {});
+    },
+    dispose() {
+      if (disposed) return;
+      disposed = true;
+      for (const handler of disposalHandlers) handler();
+    },
+    isVerifiedFor: () => verified,
+    onDisposed(handler) {
+      if (disposed) {
+        handler();
+        return;
+      }
+      disposalHandlers.push(handler);
+    },
+  };
+  return { transport, disposed: () => disposed };
+}
+
+/** A connector that resolves immediately (unless `delayMs` is given) with one fake transport per call. */
+function spyConnector(
+  connectorId: string,
+  priority: number,
+  options: { delayMs?: number; fails?: boolean; ignoreAbort?: boolean } = {},
+): {
+  connector: CultMeshRealtimeTransportConnector;
+  calls: CultMeshRealtimeCandidate[];
+  handles: FakeTransportHandle[];
+  /** Timestamps at which this connector's abort signal actually fired. */
+  aborts: number[];
+} {
+  const calls: CultMeshRealtimeCandidate[] = [];
+  const handles: FakeTransportHandle[] = [];
+  const aborts: number[] = [];
+  const connector: CultMeshRealtimeTransportConnector = {
+    connectorId,
+    priority,
+    canConnect: () => true,
+    connect: async (candidate, _target, signal) => {
+      calls.push(candidate);
+      if (options.delayMs) {
+        await new Promise<void>((resolve, reject) => {
+          const timer = setTimeout(resolve, options.delayMs);
+          if (!options.ignoreAbort) {
+            signal?.addEventListener("abort", () => {
+              clearTimeout(timer);
+              aborts.push(Date.now());
+              reject(new Error(`${connectorId} connect aborted`));
+            });
+          }
+        });
+      }
+      if (options.fails) throw new Error(`${connectorId} refused to connect`);
+      const handle = fakeTransport(candidate.endpoint);
+      handles.push(handle);
+      return handle.transport;
+    },
+  };
+  return { connector, calls, handles, aborts };
+}
+
+const target: CultMeshRealtimeTarget = { verseId: "aetheria", authorityRuntimeId: "service:aetheria.daemon" };
+
+test("fix 4: connect() caches a session and evicts it once the transport dies, so the next connect redials", async () => {
+  const { connector, calls } = spyConnector("fake", 0);
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([verseWithRoutes(target.verseId, [route()])]),
+    trust,
+    connectors: [connector],
+  });
+
+  const first = await manager.connect(target);
+  assert.equal(await manager.connect(target), first, "a live session is returned from cache, not redialed");
+  assert.equal(calls.length, 1);
+
+  first.dispose();
+  const second = await manager.connect(target);
+  assert.notEqual(second, first, "a dead session is evicted, so the next connect redials");
+  assert.equal(calls.length, 2);
+});
+
+test("fix 4: concurrent connect() calls for the same target share one dial (single-flight)", async () => {
+  const { connector, calls } = spyConnector("fake", 0, { delayMs: 50 });
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([verseWithRoutes(target.verseId, [route()])]),
+    trust,
+    connectors: [connector],
+  });
+
+  const [a, b, c] = await Promise.all([manager.connect(target), manager.connect(target), manager.connect(target)]);
+  assert.equal(a, b);
+  assert.equal(b, c);
+  assert.equal(calls.length, 1, "three concurrent callers must share one dial");
+});
+
+test("fix 4/low: dispose() aborts a dial in flight instead of letting it land and discarding the result", async () => {
+  // A long delay: if `dispose()` did not cancel the dial, this test would
+  // have to wait it out (or race a timing-dependent assertion) to observe
+  // that the eventually-created transport gets disposed instead of cached.
+  const { connector, handles } = spyConnector("fake", 0, { delayMs: 5_000 });
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([verseWithRoutes(target.verseId, [route()])]),
+    trust,
+    connectors: [connector],
+  });
+
+  const pending = manager.connect(target);
+  const start = Date.now();
+  manager.dispose();
+  await assert.rejects(pending);
+  assert.ok(
+    Date.now() - start < 1_000,
+    "dispose() must cancel the in-flight dial rather than waiting out the connector's own timeout",
+  );
+  assert.equal(handles.length, 0, "an aborted dial must never construct a transport only to immediately discard it");
+  await assert.rejects(manager.connect(target), /disposed/i, "a disposed manager refuses further connects");
+});
+
+test("fix 4/low: disconnect() during a dial does not let the dial cache a session once it lands", async () => {
+  const { connector, handles } = spyConnector("fake", 0, { delayMs: 30 });
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([verseWithRoutes(target.verseId, [route()])]),
+    trust,
+    connectors: [connector],
+  });
+
+  const pending = manager.connect(target);
+  manager.disconnect(target);
+  await assert.rejects(pending);
+  // Whether or not the aborted dial still managed to construct a transport
+  // (a race against the abort), it must end up disposed, never cached.
+  await new Promise((resolve) => setTimeout(resolve, 60));
+  for (const handle of handles) assert.equal(handle.disposed(), true, "a cancelled dial's transport must be disposed");
+
+  // The manager itself is still usable: a fresh connect redials and succeeds.
+  const { connector: connector2 } = spyConnector("fake", 0);
+  const manager2 = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([verseWithRoutes(target.verseId, [route()])]),
+    trust,
+    connectors: [connector2],
+  });
+  const fresh = await manager2.connect(target);
+  assert.ok(fresh);
+});
+
+test("fix 5: the race returns the first verified success and aborts the losers", async () => {
+  const winner = spyConnector("fast", 0, { delayMs: 10 });
+  const loser = spyConnector("slow", 0, { delayMs: 5_000 });
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes(target.verseId, [
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9001" }),
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9002" }),
+      ]),
+    ]),
+    trust,
+    connectors: [winner.connector, loser.connector],
+    maxRacedCandidates: 2,
+  });
+
+  const startedAt = Date.now();
+  const transport = await manager.connect(target);
+  const elapsedMs = Date.now() - startedAt;
+  assert.ok(elapsedMs < 1_000, `connect() must return on the first success, not wait out the slow route (took ${elapsedMs}ms)`);
+  assert.equal(transport.endpoint, "cultmesh-state+quic://127.0.0.1:9001");
+});
+
+test("F5abort: a losing candidate is told to abort promptly, not left to run out its own timeout", async () => {
+  const winner = spyConnector("fast", 0, { delayMs: 10 });
+  const loser = spyConnector("slow", 0, { delayMs: 5_000 });
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes(target.verseId, [
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9001" }),
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9002" }),
+      ]),
+    ]),
+    trust,
+    connectors: [winner.connector, loser.connector],
+    maxRacedCandidates: 2,
+  });
+
+  const startedAt = Date.now();
+  await manager.connect(target);
+  await new Promise((resolve) => setTimeout(resolve, 300));
+  assert.equal(loser.aborts.length, 1, "the losing candidate's connect() must observe an abort signal");
+  assert.ok(
+    loser.aborts[0]! - startedAt < 1_000,
+    "the abort must arrive promptly after the winner is decided, not after the loser's own 5s timeout",
+  );
+});
+
+test("F5loser: a losing candidate that connects anyway (past the point abort helps) is disposed, not left dangling", async () => {
+  const winner = spyConnector("fast", 0, { delayMs: 10 });
+  // Ignores the abort signal entirely, simulating a candidate already past
+  // the point where cancellation helps: it still produces a real transport.
+  const loser = spyConnector("slow", 0, { delayMs: 80, ignoreAbort: true });
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes(target.verseId, [
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9001" }),
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9002" }),
+      ]),
+    ]),
+    trust,
+    connectors: [winner.connector, loser.connector],
+    maxRacedCandidates: 2,
+  });
+
+  const transport = await manager.connect(target);
+  assert.equal(transport.endpoint, "cultmesh-state+quic://127.0.0.1:9001");
+  await new Promise((resolve) => setTimeout(resolve, 200));
+  assert.equal(loser.handles.length, 1, "the loser still connects despite racing to lose");
+  assert.equal(
+    loser.handles[0]!.disposed(),
+    true,
+    "a losing candidate that connects after the race is decided must be disposed, never left connected",
+  );
+});
+
+test("M6: maxRacedCandidates caps how many candidates in a tier are attempted", async () => {
+  const spy = spyConnector("fake", 0);
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes(target.verseId, [
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9001", priority: 0 }),
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9002", priority: 1 }),
+        route({ endpoint: "cultmesh-state+quic://127.0.0.1:9003", priority: 2 }),
+      ]),
+    ]),
+    trust,
+    connectors: [spy.connector],
+    maxRacedCandidates: 1,
+  });
+
+  await manager.connect(target);
+  assert.equal(spy.calls.length, 1, "only the top maxRacedCandidates entries in the tier are attempted");
+  assert.equal(spy.calls[0]!.endpoint, "cultmesh-state+quic://127.0.0.1:9001", "the lowest route priority races first");
+});
+
+test("M7: a route whose protocolIds omit the realtime-state protocol is not a candidate", async () => {
+  const spy = spyConnector("fake", 0);
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes(target.verseId, [route({ protocolIds: ["cultmesh.other_protocol.v1"] })]),
+    ]),
+    trust,
+    connectors: [spy.connector],
+  });
+
+  await assert.rejects(manager.connect(target), /No realtime state route was advertised/);
+  assert.equal(spy.calls.length, 0);
+});
+
+test("M8: a route advertised for a different authorityRuntimeId is not a candidate", async () => {
+  const spy = spyConnector("fake", 0);
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes(target.verseId, [route({ authorityRuntimeId: "service:other.daemon" })]),
+    ]),
+    trust,
+    connectors: [spy.connector],
+  });
+
+  await assert.rejects(manager.connect(target), /No realtime state route was advertised/);
+  assert.equal(spy.calls.length, 0);
+});
+
+test("M9: the session key includes authorityRuntimeId, so two authorities in the same Verse get separate sessions", async () => {
+  const spy = spyConnector("fake", 0);
+  const targetA: CultMeshRealtimeTarget = { verseId: "aetheria", authorityRuntimeId: "service:a.daemon" };
+  const targetB: CultMeshRealtimeTarget = { verseId: "aetheria", authorityRuntimeId: "service:b.daemon" };
+  const manager = new CultMeshQuicRealtimeSessionManager({
+    lookupSource: new CultMeshStaticRealtimeLookupSource([
+      verseWithRoutes("aetheria", [
+        route({ authorityRuntimeId: "service:a.daemon", endpoint: "cultmesh-state+quic://127.0.0.1:9001" }),
+        route({ authorityRuntimeId: "service:b.daemon", endpoint: "cultmesh-state+quic://127.0.0.1:9002" }),
+      ]),
+    ]),
+    trust,
+    connectors: [spy.connector],
+  });
+
+  const sessionA = await manager.connect(targetA);
+  const sessionB = await manager.connect(targetB);
+  assert.notEqual(sessionA, sessionB);
+  assert.equal(sessionA.endpoint, "cultmesh-state+quic://127.0.0.1:9001");
+  assert.equal(sessionB.endpoint, "cultmesh-state+quic://127.0.0.1:9002");
+  assert.equal(spy.calls.length, 2);
+});

packages/cultmesh-ts/test/realtime-wire.test.ts

@@ -0,0 +1,397 @@
+// The realtime frame codec, pinned rule by rule against the C# reference.
+//
+// The bytes themselves are pinned by two committed files under
+// `contracts/cultmesh/`. `realtime-frame-vectors.json` is written by
+// `CultMeshRealtimeWireProtocolTests.RealtimeFrameVectorsAreSharedWithTypeScript`
+// under CULTMESH_WRITE_VECTORS=1: this side decodes it and re-encodes to the
+// same bytes. `realtime-frame-vectors.ts-written.json` is written by
+// `scripts/write-cultmesh-realtime-frame-vectors.mjs` with this codec and
+// decoded by the C# reference, so parity is proven in both directions and in
+// two processes. A fixture authored on one side alone would only agree with
+// itself, which is what the authority vectors already taught.
+
+import test from "node:test";
+import assert from "node:assert/strict";
+import { createHash } from "node:crypto";
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+import {
+  CULTMESH_REALTIME_ALPN,
+  CULTMESH_REALTIME_CONNECTION_CLOSE_CODE,
+  CULTMESH_REALTIME_LATEST_ONLY_STREAM,
+  CULTMESH_REALTIME_MAX_ENCODED_FRAME_BYTES,
+  CULTMESH_REALTIME_MAX_PAYLOAD_BYTES,
+  CULTMESH_REALTIME_RELIABLE_STREAM,
+  CULTMESH_REALTIME_STREAM_ABORT_CODE,
+  decodeRealtimeFrame,
+  encodeRealtimeFrame,
+  type CultMeshRealtimeDelivery,
+  type CultMeshRealtimeFrame,
+} from "../src/realtime-wire";
+
+const CONTRACTS = join(__dirname, "..", "..", "..", "..", "contracts", "cultmesh");
+const CSHARP_VECTORS = join(CONTRACTS, "realtime-frame-vectors.json");
+const TS_VECTORS = join(CONTRACTS, "realtime-frame-vectors.ts-written.json");
+
+interface IdentityRule { repeat: string; byteLength: number }
+interface RampRule { ramp: number }
+interface VectorFields {
+  channelId: string | IdentityRule;
+  schemaId: string | IdentityRule;
+  bodyId: string | IdentityRule;
+  producerEpoch: number;
+  sequence: number;
+  delivery: CultMeshRealtimeDelivery;
+  payload: string | RampRule;
+}
+interface Vectors {
+  frames: {
+    label: string;
+    fields: VectorFields;
+    encoding: string | null;
+    encodedLength: number;
+    sha256OfEncoding: string;
+  }[];
+  malformed: { label: string; encoding: string; message: string }[];
+}
+
+/** The repeat unit written whole until the UTF-8 byte length is exactly `byteLength`. */
+function repeatToByteLength(unit: string, byteLength: number): string {
+  const unitBytes = Buffer.byteLength(unit, "utf8");
+  assert.equal(byteLength % unitBytes, 0, `'${unit}' is ${unitBytes} UTF-8 bytes and does not divide ${byteLength}`);
+  return unit.repeat(byteLength / unitBytes);
+}
+
+/** The deterministic payload both runtimes build the same way. */
+function ramp(length: number): Uint8Array {
+  const bytes = new Uint8Array(length);
+  for (let index = 0; index < length; index += 1) bytes[index] = index % 251;
+  return bytes;
+}
+
+function identity(value: string | IdentityRule): string {
+  return typeof value === "string" ? value : repeatToByteLength(value.repeat, value.byteLength);
+}
+
+function payload(value: string | RampRule): Uint8Array {
+  return typeof value === "string" ? new Uint8Array(Buffer.from(value, "base64")) : ramp(value.ramp);
+}
+
+function frameOf(fields: VectorFields): CultMeshRealtimeFrame {
+  return {
+    channelId: identity(fields.channelId),
+    schemaId: identity(fields.schemaId),
+    bodyId: identity(fields.bodyId),
+    // The C# `long` fields are written as JSON integers and can exceed the safe
+    // integer range, so they are read from the raw text, never through
+    // `JSON.parse`'s number.
+    producerEpoch: 0n,
+    sequence: 0n,
+    delivery: fields.delivery,
+    payload: payload(fields.payload),
+  };
+}
+
+// `JSON.parse` would round `long.MaxValue` to 9223372036854775808, which is not
+// a valid i64 and not what either side encoded. The two i64 fields are lifted
+// out of the raw text as bigints before the document is parsed.
+function readVectors(path: string): { doc: Vectors; int64s: Map<string, { producerEpoch: bigint; sequence: bigint }> } {
+  const text = readFileSync(path, "utf8");
+  const int64s = new Map<string, { producerEpoch: bigint; sequence: bigint }>();
+  const pattern = /"label": "(?<label>(?:[^"\\]|\\.)*)"[\s\S]*?"producerEpoch": (?<epoch>-?\d+),\s*"sequence": (?<sequence>-?\d+),/g;
+  for (const match of text.matchAll(pattern)) {
+    const groups = match.groups!;
+    int64s.set(JSON.parse(`"${groups["label"]!}"`) as string, {
+      producerEpoch: BigInt(groups["epoch"]!),
+      sequence: BigInt(groups["sequence"]!),
+    });
+  }
+  return { doc: JSON.parse(text) as Vectors, int64s };
+}
+
+const sha256 = (bytes: Uint8Array) => createHash("sha256").update(bytes).digest("hex");
+
+for (const [label, path] of [["C# reference", CSHARP_VECTORS], ["TypeScript-written", TS_VECTORS]] as const) {
+  test(`every ${label} frame vector decodes to its recorded fields and re-encodes to its recorded bytes`, () => {
+    const { doc, int64s } = readVectors(path);
+    assert.ok(doc.frames.length >= 8, `${label} carries ${doc.frames.length} frames`);
+    const seen = new Set<CultMeshRealtimeDelivery>();
+    for (const vector of doc.frames) {
+      const int64 = int64s.get(vector.label);
+      assert.ok(int64, `${vector.label}: no i64 pair was lifted from the text`);
+      const frame = { ...frameOf(vector.fields), ...int64 };
+      seen.add(frame.delivery);
+
+      // This side encodes the recorded fields to the recorded bytes.
+      const encoded = encodeRealtimeFrame(frame);
+      assert.equal(encoded.byteLength, vector.encodedLength, vector.label);
+      assert.equal(sha256(encoded), vector.sha256OfEncoding, vector.label);
+      // The two oversized cases carry no literal encoding; the digest above is
+      // the whole of their parity.
+      const recorded = vector.encoding === null ? encoded : new Uint8Array(Buffer.from(vector.encoding, "base64"));
+      assert.deepEqual(recorded, encoded, vector.label);
+
+      // And decodes those bytes back to the recorded fields.
+      const decoded = decodeRealtimeFrame(recorded);
+      assert.equal(decoded.channelId, frame.channelId, vector.label);
+      assert.equal(decoded.schemaId, frame.schemaId, vector.label);
+      assert.equal(decoded.bodyId, frame.bodyId, vector.label);
+      assert.equal(decoded.producerEpoch, frame.producerEpoch, vector.label);
+      assert.equal(decoded.sequence, frame.sequence, vector.label);
+      assert.equal(decoded.delivery, frame.delivery, vector.label);
+      assert.deepEqual(decoded.payload, frame.payload, vector.label);
+    }
+    // One vector per delivery mode, or a mode is unpinned.
+    assert.deepEqual([...seen].sort(), ["latest-only", "reliable-ordered", "unreliable"]);
+  });
+
+  test(`every ${label} malformed vector is refused with the C# reference's exact message`, () => {
+    const { doc } = readVectors(path);
+    assert.ok(doc.malformed.length >= 8, `${label} carries ${doc.malformed.length} malformed frames`);
+    for (const vector of doc.malformed) {
+      const bytes = new Uint8Array(Buffer.from(vector.encoding, "base64"));
+      assert.throws(
+        () => decodeRealtimeFrame(bytes),
+        (error: Error) => error.message === vector.message,
+        `${vector.label}: expected ${JSON.stringify(vector.message)}`,
+      );
+    }
+    // Every refusal the C# decoder can give is exercised by the file.
+    assert.deepEqual([...new Set(doc.malformed.map(vector => vector.message))].sort(), [
+      "Realtime frame delivery mode is invalid.",
+      "Realtime frame header is truncated.",
+      "Realtime frame length is invalid.",
+      "Realtime frame magic is invalid.",
+      "Realtime frame wire version is unsupported.",
+    ]);
+  });
+}
+
+const sample = (overrides: Partial<CultMeshRealtimeFrame> = {}): CultMeshRealtimeFrame => ({
+  channelId: "aetheria.zone-1",
+  schemaId: "cultmesh.realtime.v1",
+  bodyId: "body-7",
+  producerEpoch: 1n,
+  sequence: 2n,
+  delivery: "reliable-ordered",
+  payload: Uint8Array.from([1, 2, 3]),
+  ...overrides,
+});
+
+test("the wire constants are the C# reference's, including the ALPN and the two QUIC error codes", () => {
+  assert.equal(CULTMESH_REALTIME_ALPN, "cultmesh-state-v1");
+  assert.equal(CULTMESH_REALTIME_CONNECTION_CLOSE_CODE, 0x43554c54n);
+  assert.equal(CULTMESH_REALTIME_STREAM_ABORT_CODE, 0x53544154n);
+  assert.equal(CULTMESH_REALTIME_RELIABLE_STREAM, 1);
+  assert.equal(CULTMESH_REALTIME_LATEST_ONLY_STREAM, 2);
+  assert.equal(CULTMESH_REALTIME_MAX_PAYLOAD_BYTES, 64 * 1024 * 1024);
+  assert.equal(CULTMESH_REALTIME_MAX_ENCODED_FRAME_BYTES, 64 * 1024 * 1024 + 37 + 3 * 65535);
+  // The ALPN and the close codes are ASCII the C# side spells as numbers.
+  assert.equal(Buffer.from("CULT", "ascii").readUInt32BE(0), Number(CULTMESH_REALTIME_CONNECTION_CLOSE_CODE));
+  assert.equal(Buffer.from("STAT", "ascii").readUInt32BE(0), Number(CULTMESH_REALTIME_STREAM_ABORT_CODE));
+});
+
+// `CultMeshRealtimeWireProtocol.cs:37-54`, offset by offset. A vector proves the
+// whole layout at once; this says which byte carries which field, so a swap of
+// two same-width fields names itself.
+test("the fixed header is 37 little-endian bytes in the reference's order", () => {
+  const encoded = encodeRealtimeFrame(sample({
+    channelId: "ch", schemaId: "sch", bodyId: "bdy",
+    producerEpoch: 0x0102030405060708n, sequence: 0x1112131415161718n,
+    delivery: "unreliable", payload: Uint8Array.from([0xaa]),
+  }));
+  const view = new DataView(encoded.buffer, encoded.byteOffset, encoded.byteLength);
+  assert.equal(view.getUint32(0, true), 0x31545343, "magic, little-endian");
+  assert.deepEqual([...encoded.subarray(0, 4)], [0x43, 0x53, 0x54, 0x31], "magic bytes as written");
+  assert.equal(encoded[4], 2, "delivery");
+  assert.equal(view.getBigInt64(5, true), 0x0102030405060708n, "producer epoch");
+  assert.equal(view.getBigInt64(13, true), 0x1112131415161718n, "sequence");
+  assert.equal(view.getUint16(21, true), 2, "channel length");
+  assert.equal(view.getUint16(23, true), 3, "schema length");
+  assert.equal(view.getUint16(25, true), 3, "body length");
+  assert.equal(view.getInt32(27, true), 1, "payload length");
+  assert.equal(view.getInt32(31, true), 37, "header size");
+  assert.equal(view.getUint16(35, true), 1, "wire version");
+  assert.equal(Buffer.from(encoded.subarray(37, 37 + 2 + 3 + 3)).toString("utf8"), "chschbdy", "identities in order");
+  assert.deepEqual([...encoded.subarray(45)], [0xaa], "payload last");
+  assert.equal(encoded.byteLength, 37 + 2 + 3 + 3 + 1);
+});
+
+test("the delivery byte is the C# enum ordinal: 0, 1, 2 in that order", () => {
+  const bytes: Record<CultMeshRealtimeDelivery, number> = { "reliable-ordered": 0, "latest-only": 1, "unreliable": 2 };
+  for (const [delivery, byte] of Object.entries(bytes) as [CultMeshRealtimeDelivery, number][]) {
+    const encoded = encodeRealtimeFrame(sample({ delivery }));
+    assert.equal(encoded[4], byte, delivery);
+    assert.equal(decodeRealtimeFrame(encoded).delivery, delivery, delivery);
+  }
+  assert.throws(
+    () => encodeRealtimeFrame(sample({ delivery: "at-most-once" as CultMeshRealtimeDelivery })),
+    /delivery mode is invalid/,
+  );
+});
+
+test("identities are UTF-8 and their length prefixes count bytes, not characters", () => {
+  const frame = sample({ channelId: "z\u00f6ne-\u221e", schemaId: "s", bodyId: "b" });
+  const encoded = encodeRealtimeFrame(frame);
+  const view = new DataView(encoded.buffer, encoded.byteOffset, encoded.byteLength);
+  assert.equal(frame.channelId.length, 6);
+  assert.equal(view.getUint16(21, true), Buffer.byteLength(frame.channelId, "utf8"));
+  assert.equal(view.getUint16(21, true), 9);
+  assert.equal(decodeRealtimeFrame(encoded).channelId, frame.channelId);
+});
+
+test("an identity of exactly 65535 UTF-8 bytes encodes and one byte more is refused", () => {
+  const wide = repeatToByteLength("\u00e4\u20ac", 65535);
+  assert.equal(Buffer.byteLength(wide, "utf8"), 65535);
+  assert.notEqual(wide.length, 65535);
+  const encoded = encodeRealtimeFrame(sample({ channelId: wide }));
+  assert.equal(new DataView(encoded.buffer, encoded.byteOffset).getUint16(21, true), 65535);
+  assert.equal(decodeRealtimeFrame(encoded).channelId, wide);
+  for (const field of ["channelId", "schemaId", "bodyId"] as const) {
+    assert.throws(
+      () => encodeRealtimeFrame(sample({ [field]: `${wide}a` })),
+      /identity exceeds the QUIC wire limit/,
+      field,
+    );
+  }
+});
+
+test("a payload at the 64 MiB ceiling encodes and one byte more is refused", () => {
+  const encoded = encodeRealtimeFrame(sample({ payload: ramp(CULTMESH_REALTIME_MAX_PAYLOAD_BYTES) }));
+  assert.equal(encoded.byteLength, 37 + 15 + 20 + 6 + CULTMESH_REALTIME_MAX_PAYLOAD_BYTES);
+  assert.equal(decodeRealtimeFrame(encoded).payload.byteLength, CULTMESH_REALTIME_MAX_PAYLOAD_BYTES);
+  assert.throws(
+    () => encodeRealtimeFrame(sample({ payload: new Uint8Array(CULTMESH_REALTIME_MAX_PAYLOAD_BYTES + 1) })),
+    /payload exceeds the QUIC wire limit/,
+  );
+});
+
+// `CultMeshRealtimeTransports.cs:29-39`, message for message. The blank strings
+// are C#'s `IsNullOrWhiteSpace` set, not `String.prototype.trim`'s: U+0085 is
+// whitespace to .NET and not to JavaScript, and U+FEFF the other way round.
+test("encode refuses what the transport contract forbids, in the reference's words", () => {
+  for (const blank of ["", " ", "\t", "\u0085", "\u3000"]) {
+    assert.throws(() => encodeRealtimeFrame(sample({ channelId: blank })), /^Error: Realtime channel identity is required\.$/);
+    assert.throws(() => encodeRealtimeFrame(sample({ schemaId: blank })), /^Error: Realtime schema identity is required\.$/);
+    assert.throws(() => encodeRealtimeFrame(sample({ bodyId: blank })), /^Error: Realtime body identity is required\.$/);
+  }
+  // U+FEFF is not whitespace to .NET, so it is a legal one-character identity.
+  assert.equal(decodeRealtimeFrame(encodeRealtimeFrame(sample({ channelId: "\ufeff" }))).channelId, "\ufeff");
+  assert.throws(() => encodeRealtimeFrame(sample({ producerEpoch: -1n })), /epoch and sequence must be non-negative/);
+  assert.throws(() => encodeRealtimeFrame(sample({ sequence: -1n })), /epoch and sequence must be non-negative/);
+  // C# gets this bound from `long`; a bigint does not.
+  assert.throws(() => encodeRealtimeFrame(sample({ sequence: 2n ** 63n })), /must fit a 64-bit signed integer/);
+  assert.equal(encodeRealtimeFrame(sample({ sequence: 2n ** 63n - 1n })).byteLength, 37 + 15 + 20 + 6 + 3);
+});
+
+// `CultMeshRealtimeWireProtocol.cs:60-76`, refusal for refusal and in the same
+// order: a frame that breaks two rules names the earlier one.
+test("decode refuses every malformed frame the reference refuses, in the reference's order", () => {
+  const good = encodeRealtimeFrame(sample());
+  const spoil = (mutate: (bytes: Uint8Array) => void) => { const copy = Uint8Array.from(good); mutate(copy); return copy; };
+  const cases: readonly (readonly [string, Uint8Array, string])[] = [
+    ["a header one byte short", good.subarray(0, 36), "Realtime frame header is truncated."],
+    ["an empty buffer", new Uint8Array(0), "Realtime frame header is truncated."],
+    ["a wrong magic", spoil(bytes => { bytes[3] = 0x32; }), "Realtime frame magic is invalid."],
+    ["a big-endian magic", spoil(bytes => bytes.set([0x31, 0x54, 0x53, 0x43], 0)), "Realtime frame magic is invalid."],
+    ["wire version 0", spoil(bytes => { bytes[35] = 0; }), "Realtime frame wire version is unsupported."],
+    ["wire version 2", spoil(bytes => { bytes[35] = 2; }), "Realtime frame wire version is unsupported."],
+    ["header size 36", spoil(bytes => { bytes[31] = 36; }), "Realtime frame wire version is unsupported."],
+    ["header size 38", spoil(bytes => { bytes[31] = 38; }), "Realtime frame wire version is unsupported."],
+    ["delivery 3", spoil(bytes => { bytes[4] = 3; }), "Realtime frame delivery mode is invalid."],
+    ["delivery 255", spoil(bytes => { bytes[4] = 255; }), "Realtime frame delivery mode is invalid."],
+    ["a negative payload length", spoil(bytes => { bytes[30] = 0x80; }), "Realtime frame length is invalid."],
+    ["one byte too many", Uint8Array.from([...good, 0]), "Realtime frame length is invalid."],
+    ["one byte too few", good.subarray(0, good.byteLength - 1), "Realtime frame length is invalid."],
+    ["a channel length one too long", spoil(bytes => { bytes[21] += 1; }), "Realtime frame length is invalid."],
+  ];
+  for (const [label, bytes, message] of cases) {
+    assert.throws(() => decodeRealtimeFrame(bytes), (error: Error) => error.message === message, label);
+  }
+  // Order: a frame whose magic and delivery are both wrong is refused for the
+  // magic, and one whose version and delivery are both wrong for the version.
+  assert.throws(
+    () => decodeRealtimeFrame(spoil(bytes => { bytes[3] = 0x32; bytes[4] = 9; })),
+    (error: Error) => error.message === "Realtime frame magic is invalid.",
+  );
+  assert.throws(
+    () => decodeRealtimeFrame(spoil(bytes => { bytes[35] = 3; bytes[4] = 9; })),
+    (error: Error) => error.message === "Realtime frame wire version is unsupported.",
+  );
+  // Like the reference, decode does not re-run the transport contract: a frame
+  // with a blank identity decodes rather than being refused.
+  const blank = spoil(bytes => bytes.set(new Uint8Array(15).fill(0x20), 37));
+  assert.equal(decodeRealtimeFrame(blank).channelId, " ".repeat(15));
+});
+
+// The `payloadLength < 0` clause in the length refusal is not redundant with the
+// sum check beside it, which is what a surviving mutant that dropped it claimed.
+// A negative payload length cancels against the identity lengths, so a frame can
+// be crafted whose sum lands exactly on its own byte length. Without the clause
+// each of these decodes to blank identities and an empty payload where the C#
+// reference (`CultMeshRealtimeWireProtocol.cs:74-76`, same clause) refuses.
+test("decode refuses a negative payload length that the length sum cancels out", () => {
+  const good = encodeRealtimeFrame(sample());
+  // A valid magic, wire version, header size and delivery byte, then the three
+  // identity lengths and the payload length written by hand.
+  const crafted = (channelLength: number, payloadLength: number, totalBytes: number) => {
+    const bytes = new Uint8Array(totalBytes);
+    bytes.set(good.subarray(0, 37), 0);
+    const view = new DataView(bytes.buffer);
+    view.setUint16(21, channelLength, true);
+    view.setUint16(23, 0, true);
+    view.setUint16(25, 0, true);
+    view.setInt32(27, payloadLength, true);
+    // The sum the decoder computes must land exactly on the frame's own length,
+    // or the check beside the clause would refuse it and prove nothing.
+    assert.equal(37 + channelLength + 0 + 0 + payloadLength, totalBytes, "the crafted sum must match");
+    return bytes;
+  };
+  const cases: readonly (readonly [string, Uint8Array])[] = [
+    ["a maximal channel length cancelled by -65535, summing to 37", crafted(0xffff, -0xffff, 37)],
+    ["a channel length of 1 cancelled by -1, summing to 37", crafted(1, -1, 37)],
+    ["a channel length of 2 cancelled by -1, summing to 38", crafted(2, -1, 38)],
+  ];
+  for (const [label, bytes] of cases) {
+    assert.throws(
+      () => decodeRealtimeFrame(bytes),
+      (error: Error) => error.message === "Realtime frame length is invalid.",
+      label,
+    );
+  }
+});
+
+test("decode reads exactly the viewed bytes of an offset view, not the buffer behind it", () => {
+  const good = encodeRealtimeFrame(sample({ payload: Uint8Array.from([9, 8, 7]) }));
+  const pool = new Uint8Array(good.byteLength + 64).fill(0xa5);
+  pool.set(good, 17);
+  const view = pool.subarray(17, 17 + good.byteLength);
+  assert.deepEqual(decodeRealtimeFrame(view).payload, Uint8Array.from([9, 8, 7]));
+  assert.equal(decodeRealtimeFrame(view).channelId, "aetheria.zone-1");
+  // And the decoded payload does not alias the frame it came from.
+  const decoded = decodeRealtimeFrame(good);
+  good[good.byteLength - 1] = 0;
+  assert.deepEqual(decoded.payload, Uint8Array.from([9, 8, 7]));
+});
+
+// The `Uint8Array` case above passes with a plain `bytes.slice(...)`; this one
+// does not. Node's `Buffer` overrides `slice` with an alias of `subarray`, and a
+// `Buffer` is what a socket read hands a Node caller, so the aliasing bug this
+// pins is the one that would actually reach a consumer.
+test("the decoded payload copies out of a Node Buffer too, which overrides slice", () => {
+  const frame = Buffer.from(encodeRealtimeFrame(sample({ payload: Uint8Array.from([9, 8, 7]) })));
+  const decoded = decodeRealtimeFrame(frame);
+  frame[frame.byteLength - 1] = 0;
+  assert.deepEqual(decoded.payload, Uint8Array.from([9, 8, 7]), "payload unchanged by a later write to the frame");
+  assert.equal(Buffer.isBuffer(decoded.payload), false, "the copy is a plain Uint8Array, not a Buffer");
+  assert.notEqual(decoded.payload.buffer, frame.buffer, "the copy has its own backing store");
+  // The three identities need no such check: `TextDecoder` returns strings, which
+  // hold no reference to the bytes they were decoded from.
+  assert.equal(decoded.channelId, "aetheria.zone-1");
+});
+
+test("the codec touches no socket: no node: import in the source", () => {
+  const source = readFileSync(join(__dirname, "..", "..", "src", "realtime-wire.ts"), "utf8");
+  assert.doesNotMatch(source, /from "node:|require\("node:/);
+});

packages/cultmesh-ts/test/support/native-bridge.ts

@@ -0,0 +1,20 @@
+// Shared by every QUIC test file that skips instead of failing when no native
+// bridge is built: true only when both the bridge and its `msquic` dependency
+// are present under `CULTMESH_QUIC_NATIVE_DIR`.
+
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+export function nativeBridgeAvailable(): boolean {
+  const dir = process.env.CULTMESH_QUIC_NATIVE_DIR;
+  if (!dir) return false;
+  try {
+    const bridge = process.platform === "win32" ? "gamecult_mesh_quic_native.dll" : "libgamecult_mesh_quic_native.so";
+    const dependency = process.platform === "win32" ? "msquic.dll" : "libmsquic.so.2";
+    readFileSync(join(dir, bridge));
+    readFileSync(join(dir, dependency));
+    return true;
+  } catch {
+    return false;
+  }
+}