Measure Sai web layout probe

docs/eve-migration-roadmap.md

@@ -287,13 +287,17 @@ Exit criteria:
 Recently cut:
 
 - The web reference now has a schema-backed layout probe for the
-  `embedded-surface` fixture. `scripts/run-web-reference-layout-probe-smoke.ps1`
-  builds the browser lowerer, runs Chrome headless through
+  `embedded-surface` and `sai-vn` fixtures.
+  `scripts/run-web-reference-layout-probe-smoke.ps1` builds the browser lowerer,
+  runs Chrome headless through
   `tools/web-reference/run-layout-probe.mjs`, writes
   `gamecult.eve.web_layout_probe.v1` evidence under
-  `artifacts/web-reference-layout-probe/latest/embedded-surface.json`, and
-  parity consumes that artifact so `web:embedded-surface:bounding-boxes` is
-  measured runtime evidence instead of `pending-runtime-probe`.
+  `artifacts/web-reference-layout-probe/latest/`, and parity consumes those
+  artifacts so `web:embedded-surface:bounding-boxes` and
+  `web:sai-vn:bounding-boxes` are measured runtime evidence instead of
+  `pending-runtime-probe`. This proves the browser oracle can measure both core
+  embedded slots and Sai's nested Norn/TeX plugin composition without taking
+  custody of plugin semantics.
 - The conformance export now carries `screenshotComparisonMetrics[]` records.
   Runtime owners get structure, color-token, bounding-box, and text-presence
   metrics per runtime/fixture pair without relying on byte-identical screenshots

docs/parity-testing-harness.md

@@ -434,13 +434,14 @@ box records name whether authored layout boxes exist or whether a runtime still
 owes a capture/layout probe. A missing Unity, Electron, TUI, or Direct2D capture
 body therefore appears as `pending-capture`, not as fake visual parity.
 
-The web reference has the first measured bounding-box probe. The harness runs
+The web reference has the first measured bounding-box probes. The harness runs
 `scripts/run-web-reference-layout-probe-smoke.ps1`, which builds the browser
 lowerer and uses Chrome headless to write
-`artifacts/web-reference-layout-probe/latest/embedded-surface.json` as
-`gamecult.eve.web_layout_probe.v1`. Parity consumes that artifact and marks
-`web:embedded-surface:bounding-boxes` as `pass` with
-`evidenceLayer: runtime-layout-probe`.
+`artifacts/web-reference-layout-probe/latest/embedded-surface.json` and
+`artifacts/web-reference-layout-probe/latest/sai-vn.json` as
+`gamecult.eve.web_layout_probe.v1`. Parity consumes those artifacts and marks
+`web:embedded-surface:bounding-boxes` and `web:sai-vn:bounding-boxes` as `pass`
+with `evidenceLayer: runtime-layout-probe`.
 
 The fixture matrix also includes `embedded-surface`, which proves that nested
 CultMesh document slots survive the shared surface contract. The web reference,
@@ -509,8 +510,8 @@ Pending runtimes are allowed. Silent fake parity is not.
 
 ## Next Cuts
 
-1. Extend runtime-owned image/layout probes beyond web `embedded-surface`,
-   starting with Sai VN in web and the Unity/Electron/TUI capture blockers.
+1. Extend runtime-owned image/layout probes to the Unity/Electron/TUI capture
+   blockers.
 2. Normalize text scale and font loading across web, Flutter Android, Flutter
    desktop, and iOS.
 3. Give iOS a real `vn.stage` scene compositor instead of compact stacked

scripts/run-conformance-consumer-smoke.ps1

@@ -67,6 +67,9 @@ try {
     --expect-screenshot-metric web:embedded-surface:color-tokens:pass `
     --expect-screenshot-metric web:embedded-surface:text-presence:pass `
     --expect-screenshot-metric web:embedded-surface:bounding-boxes:pass `
+    --expect-screenshot-metric web:sai-vn:structure:pass `
+    --expect-screenshot-metric web:sai-vn:color-tokens:pass `
+    --expect-screenshot-metric web:sai-vn:bounding-boxes:pass `
     --expect-screenshot-metric electron-shell:aetheria-world:bounding-boxes:pending-capture `
     --expect-capability-gap "split-target:EveUnity:EveUnity:proof:Tagged UPM release" `
     --expect-conformance-handoff

scripts/run-parity-harness.ps1

@@ -14,6 +14,12 @@ $env:EVE_PARITY_OUTPUT = if ([System.IO.Path]::IsPathRooted($OutputDirectory)) {
 Push-Location $projectRoot
 try {
   & (Join-Path $PSScriptRoot "run-web-reference-layout-probe-smoke.ps1")
+  & (Join-Path $PSScriptRoot "run-web-reference-layout-probe-smoke.ps1") `
+    -ProviderId "gamecult.home.vn" `
+    -FixtureId "sai-vn" `
+    -OutputPath "artifacts\web-reference-layout-probe\latest\sai-vn.json" `
+    -Port 8893 `
+    -SkipBuild
   node .\tools\parity\run-parity.mjs
   & (Join-Path $PSScriptRoot "run-eveconformance-handoff-smoke.ps1")
   & (Join-Path $PSScriptRoot "run-plugin-handoff-smoke.ps1")

scripts/run-runtime-owner-conformance-consumer-smoke.ps1

@@ -128,6 +128,9 @@ node $consumerScript $consumerExport `
   --expect-screenshot-metric web:embedded-surface:color-tokens:pass `
   --expect-screenshot-metric web:embedded-surface:text-presence:pass `
   --expect-screenshot-metric web:embedded-surface:bounding-boxes:pass `
+  --expect-screenshot-metric web:sai-vn:structure:pass `
+  --expect-screenshot-metric web:sai-vn:color-tokens:pass `
+  --expect-screenshot-metric web:sai-vn:bounding-boxes:pass `
   --expect-screenshot-metric unity-scene:aetheria-world:bounding-boxes:pending-capture `
   --expect-screenshot-metric electron-shell:aetheria-world:bounding-boxes:pending-capture `
   --expect-screenshot-metric tui:aetheria-world:bounding-boxes:pending-capture `

scripts/run-web-reference-layout-probe-smoke.ps1

@@ -4,7 +4,8 @@ param(
   [string] $OutputPath = "artifacts\web-reference-layout-probe\latest\embedded-surface.json",
   [int] $Port = 8892,
   [int] $Width = 1280,
-  [int] $Height = 720
+  [int] $Height = 720,
+  [switch] $SkipBuild
 )
 
 $ErrorActionPreference = "Stop"
@@ -18,9 +19,11 @@ $absoluteOutputPath = if ([System.IO.Path]::IsPathRooted($OutputPath)) {
 
 Push-Location $projectRoot
 try {
-  npm --prefix packages/eve-browser-lowering run build | Out-Host
-  if ($LASTEXITCODE -ne 0) {
-    throw "Eve browser lowering build failed with exit code $LASTEXITCODE"
+  if (-not $SkipBuild) {
+    npm --prefix packages/eve-browser-lowering run build | Out-Host
+    if ($LASTEXITCODE -ne 0) {
+      throw "Eve browser lowering build failed with exit code $LASTEXITCODE"
+    }
   }
 
   node .\tools\web-reference\run-layout-probe.mjs `

tools/parity/parity-manifest.json

@@ -1122,6 +1122,14 @@
             "schema": "gamecult.eve.web_layout_probe.v1",
             "path": "artifacts/web-reference-layout-probe/latest/embedded-surface.json",
             "runner": "scripts/run-web-reference-layout-probe-smoke.ps1"
+          },
+          {
+            "fixtureId": "sai-vn",
+            "providerId": "gamecult.home.vn",
+            "surfaceId": "sai.visual_novel.surface",
+            "schema": "gamecult.eve.web_layout_probe.v1",
+            "path": "artifacts/web-reference-layout-probe/latest/sai-vn.json",
+            "runner": "scripts/run-web-reference-layout-probe-smoke.ps1"
           }
         ]
       }