#542 AC4: port four WebGL-era specs to WebGPU engine unit tests

playwright/playwright.config.next.ts

@@ -31,11 +31,12 @@ import { ENDURANCE_SPEC, HEAVY_SPEC, RESPONSIVE_SPEC, VISUAL_SPEC } from './view
 // matrix in `viewports.ts` already sets a project-level `testIgnore`, which
 // *replaces* any top-level one, so patterns there get silently dropped.
 const EXTRA_IGNORE = [
-  // AC4 WebGL-era specs AC4 will port to WebGPU in place.
-  '**/gl-context-budget.spec.ts',
-  '**/webgl-context-recovery.spec.ts',
-  '**/rower3d-postfx.spec.ts',
-  '**/scene-quality-match.spec.ts',
+  // AC4 WebGL-era specs — now deleted on this branch. The four behaviours
+  // they used to check (context budget, device-lost, post-fx tier gates,
+  // scene quality) are covered by
+  // `src/lib/renderer/engine/__tests__/ac4PortedBehaviors.test.ts`. The
+  // integrated boot-and-row verification they also carried re-lands on
+  // the GPU runner — see #584.
   // Need a moving boat / live engine frames (real GPU only).
   '**/crew-model-loading.spec.ts',
   '**/default-route-performance.spec.ts',

playwright/shard-weights.json

@@ -7,7 +7,6 @@
     "default:crash-telemetry.spec.ts": 30,
     "default:crew-model-loading.spec.ts": 69,
     "default:default-route-performance.spec.ts": 320,
-    "default:gl-context-budget.spec.ts": 75,
     "default:webgpu-engine-smoke.spec.ts": 45,
     "default:webgpu-scenery-smoke.spec.ts": 45,
     "default:webgpu-shadows-smoke.spec.ts": 45,
@@ -31,21 +30,18 @@
     "default:route-performance.spec.ts": 168,
     "default:rower-slide.spec.ts": 432,
     "default:rower-stroke.spec.ts": 125,
-    "default:rower3d-postfx.spec.ts": 250,
     "default:rownative-course-import.spec.ts": 9,
     "default:rownative-track-attach.spec.ts": 7,
     "default:rownative-track-geometry.spec.ts": 28,
     "default:scene-context-endurance.spec.ts": 66,
     "default:scene-contrast.spec.ts": 63,
-    "default:scene-quality-match.spec.ts": 71,
     "default:scene-telemetry.spec.ts": 19,
     "default:scenery-kit-budgets.spec.ts": 129,
     "default:shipping-scene-contrast.spec.ts": 600,
     "default:shipping-scene.spec.ts": 192,
     "default:signed-out-test-drive.spec.ts": 96,
     "default:sim-ports.spec.ts": 6,
     "default:virtualrow.spec.ts": 81,
-    "default:webgl-context-recovery.spec.ts": 142,
     "default:world-scale.spec.ts": 37,
     "desktop:responsive.spec.ts": 150,
     "laptop:responsive.spec.ts": 97,