coordination: claim static M2 build resource observer

coordination/claims/M03-RND-M2-STATIC-BUILD-RESOURCE-OBSERVER-001.md

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+# M03-RND-M2-STATIC-BUILD-RESOURCE-OBSERVER-001
+
+<!-- OPENWC_CLAIM:M03-RND-M2-STATIC-BUILD-RESOURCE-OBSERVER-001:sindo-main-codex:2026-07-20 -->
+
+## Owner
+
+- Agent ID: `sindo-main-codex`
+- Target: M03 Renderer Facade and Safe Extraction
+- Branch: `work/sindo-main-codex/m03-m2-static-build-resource-observer`
+- Worktree: `C:\Users\sindo\open-wc-worktrees\m03-m2-static-build-resource-observer`
+
+## Outcome
+
+Move static M2 build cache lookup, threaded request selection and terminal
+missing transition from the loader into a service that fills
+`M2BuildResourceSnapshot`.
+
+## Non-goals
+
+- Move animation/native prototype observation or finalize drains.
+- Own/free Meshes, Nodes or cache entries.
+- Change path candidate order, GLB filtering, retry behavior, permits or visuals.
+- Change cache formats, profiles or batching.
+
+## Paths
+
+- Exclusive: `src/render/m2/m2_static_build_resource_observer.gd`,
+  `src/tools/verify_m2_static_build_resource_observer.gd`,
+  `docs/modules/m2-static-build-resource-observer.md`, this claim
+- Shared: loader, M2 snapshot/dispatch/pipeline/cache specs and verifiers,
+  world renderer, module registry, RENDER and M03 Evidence
+
+## Contracts and data
+
+- Cached Mesh wins; terminal missing returns missing; existing pending request waits.
+- Candidate order remains normalized/lowercase nested then basename per extension.
+- `.tscn` precedes `.glb`; pivot-prefix GLB is skipped for static build.
+- Successful/`ERR_BUSY` request is remembered; no usable candidate marks missing.
+- Snapshot adopts exact Mesh/missing result; service never frees engine objects.
+
+## Dependencies
+
+- Requires: accepted resource snapshot `032a256`
+- Blocks: remaining animated resource observer extraction
+
+## Verification
+
+- Synthetic cache/pipeline/snapshot lifecycle, path order, source boundaries and timing;
+  adjacent M2 and renderer gates; full headless suite and checkpoint dry-run.
+
+## Documentation deliverables
+
+- Inline API docs; module API/I/O/ownership; data-flow/state/sequence/dependency
+  diagrams; adjacent renderer docs and M03 Evidence.
+
+## Status
+
+- State: active
+- Done: ownership/compatibility contract
+- Next: implementation, verification and documentation
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: