Image Pipeline and Material-context AO Integration

12 open closure items. Loadable does not mean accepted or performance-valid.

1. P0Define and measure the target performance contract

   The ultra, high, medium tiers have no accepted frame target. Record named device/browser/GPU, viewport, DPR, sustained CPU/GPU/presentation p50 and p95, deadline misses, memory, and settled quality. Submission time is not GPU timing.

   tiers[].frameTargetMs
2. P0Native Webgpu capability proof

   Capture current-source evidence for the declared native webgpu gate.

   capabilityRequirements.native-webgpu
3. P0Standard Depth capability proof

   Capture current-source evidence for the declared standard depth gate.

   capabilityRequirements.standard-depth
4. P0Renderer Init runtime proof

   Capture current-source evidence for the declared renderer init gate.

   runtimeProof.renderer-init
5. P0Backend Is Webgpu runtime proof

   Capture current-source evidence for the declared backend is webgpu gate.

   runtimeProof.backend-is-webgpu
6. P0Mechanism Reachable runtime proof

   Capture current-source evidence for the declared mechanism reachable gate.

   runtimeProof.mechanism-reachable
7. P0Aligned Readback runtime proof

   Capture current-source evidence for the declared aligned readback gate.

   runtimeProof.aligned-readback
8. P0Exclusive Owners runtime proof

   Capture current-source evidence for the declared exclusive owners gate.

   runtimeProof.exclusive-owners
9. P0One Prepass One Lit Pass runtime proof

   Capture current-source evidence for the declared one prepass one lit pass gate.

   runtimeProof.one-prepass-one-lit-pass
10. P0Current Adapter Timing runtime proof

    Capture current-source evidence for the declared current adapter timing gate.

    runtimeProof.current-adapter-timing
11. P1Capture a current-source evidence bundle

    Publish source-hash-bound renderer/backend facts, required diagnostic images, aligned readbacks, resource inventory, timing method, and limitations; directly inspect the important artifacts before promotion.

    evidenceBundle
12. P2Close tier-specific acceptance

    Validate and promote ultra, high, medium as independent visual and performance contracts without crossing their protected invariants.

    tiers[].acceptanceStatus