Semantic Mesh Writer

Declared evidence work remains. Overall implementation status does not establish individual runtime or performance claims.

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