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

1. P0Define and measure the target performance contract

   The full, budgeted, minimum 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

   Controller must await WebGPURenderer.init() and reject a backend where isWebGPUBackend is not true; no fallback is activated.

   capabilityRequirements.native-webgpu
3. P0Single Scene Render capability proof

   Frame execution must report exactly one scene render and no duplicate diagnostic or presentation render.

   capabilityRequirements.single-scene-render
4. P0No Post Processing capability proof

   Runtime graph and frame record must report zero post-processing passes.

   capabilityRequirements.no-post-processing
5. P0Mobile Resource Accounting capability proof

   Named-device sustained evidence must report CPU/GPU/presentation timing, render items, submissions, shadow casters, materials/pipelines, and peak live bytes.

   capabilityRequirements.mobile-resource-accounting
6. P0Renderer Init runtime proof

   Await controller readiness after WebGPURenderer.init().

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

   Capture controller metrics with nativeWebGPU true.

   runtimeProof.backend-is-webgpu
8. P0Physical Routes runtime proof

   Load all 15 scenario/mechanism/tier/camera physical routes and prove each locks exactly one route dimension.

   runtimeProof.physical-routes
9. P0Mechanism Reachable runtime proof

   Load every final, blockout, hierarchy, materials, and action-ready mechanism route and bind the observed controller mode to the physical route record.

   runtimeProof.mechanism-reachable
10. P0Target Contracts runtime proof

    Capture protected node, socket, ColliderConstructionInput, destruction-group, mode, tier, and exact-reset inventories for all three targets.

    runtimeProof.target-contracts
11. P0Render Ownership runtime proof

    Capture one renderer owner, one scene render, one tone-map owner, one output-transform owner, and zero post-processing passes.

    runtimeProof.render-ownership
12. P0Aligned Readback runtime proof

    Capture the actual integer WebGPU row stride, 256-byte alignment, compact width, height, and normalized render-target pixels for every required PNG.

    runtimeProof.aligned-readback
13. P0Visual Contracts runtime proof

    Inspect final and diagnostic PNGs for each target and record AI-vision authored-contract scores; no reference-image similarity claim is permitted.

    runtimeProof.visual-contracts
14. P0Sustained Performance runtime proof

    Record named-device sustained CPU/GPU/presentation evidence and mobile resource accounting without inventing a universal frame target.

    runtimeProof.sustained-performance
15. P2Close tier-specific acceptance

    Validate and promote full, budgeted, minimum as independent visual and performance contracts without crossing their protected invariants.

    tiers[].acceptanceStatus