Make the Eve onboarding checkpoint run against the contract that exists

The portability workflow has been red since 2026-08-22. Three things,
each hidden behind the one before it:

- Eve started refusing to build a command intent for a surface that has
  not advertised a command boundary and receipt schema (Eve 4338a42,
  2026-08-22). The two-runtime sample never advertised one. It now passes
  a provider advertisement with worldInteraction for its surface, which is
  the declaration the lowering was right to demand.
- The sample and the package-closure script still imported "cultcache-ts";
  the package became @gamecult/cultcache-ts on 2026-09-04 (8cb3b72) and
  CI never got far enough to say so. Two READMEs carried the same import.
- The job pinned Eve to codex/eve-browser-host-isolation, a branch that was
  never merged and stopped moving on 2026-08-25. The sample is written
  against Eve main and passes there; the pin now says so.

The interop workflow's Python step ran one test file by path; it now
discovers the three split suites.

  scripts/verify-eve-two-runtime-sample.ps1 -EveRoot F:\Projects\Eve
  (Eve main ccc3ffe) -> browserCount 1, headlessCount 1, restartCount 1

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.github/workflows/cultmesh-portability.yml

@@ -28,7 +28,9 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: GameCult/Eve
-          ref: ${{ vars.EVE_INTEGRATION_REF || 'codex/eve-browser-host-isolation' }}
+          # Eve main is the contract this sample is written against; the codex
+          # branch this used to pin was never merged and stopped on 2026-08-25.
+          ref: ${{ vars.EVE_INTEGRATION_REF || 'main' }}
           path: Eve
 
       - name: Set up .NET

.github/workflows/cultnet-interop.yml

@@ -87,7 +87,10 @@ jobs:
         run: npm test --workspace packages/cultnet-ts
 
       - name: Verify Python RUDP reliability
-        run: python -m unittest packages/cultcache-py/tests/test_cultcache.py
+        run: |
+          python -m unittest discover -s packages/cultcache-py/tests
+          python -m unittest discover -s packages/cultnet-py/tests
+          python -m unittest discover -s packages/cultmesh-py/tests
 
       - name: Verify Rust RUDP reliability
         run: cargo test --manifest-path packages/cultnet-rs/Cargo.toml rudp