Semantic Mesh Writer

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

1. P0Define and measure the target performance contract

   The hero, standard, crowd 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

   The canonical controller blocks unless renderer.backend.isWebGPUBackend is true after initialization.

   capabilityRequirements.native-webgpu
3. P0Storage Buffers capability proof

   StorageInstancedBufferAttribute and IndirectStorageBufferAttribute are required by the batching-comparison and indirect-draw routes.

   capabilityRequirements.storage-buffers
4. P0Renderer Init runtime proof

   Await createGeometryLabController(), which awaits renderer.init() before constructing proof state.

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

   Capture renderer.backend.isWebGPUBackend === true from the initialized controller.

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

   Load every physical mechanism route and reconcile the selected runtime graph against its locked startup mode.

   runtimeProof.mechanism-reachable
7. P0Aligned Readback runtime proof

   Capture MRT pixels using the controller's integer 256-byte-aligned row-stride contract.

   runtimeProof.aligned-readback
8. P0Indirect Command runtime proof

   Read back the compute-written indexed indirect command and reconcile its instanceCount with submitted work.

   runtimeProof.indirect-command
9. 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
10. P2Close tier-specific acceptance

    Validate and promote hero, standard, crowd as independent visual and performance contracts without crossing their protected invariants.

    tiers[].acceptanceStatus