coord(M03): claim M2 runtime mesh finalizer

Work-Package: M03-RND-M2-RUNTIME-MESH-FINALIZER-001
Agent: sindo-main-codex
Tests: coordination gate passed before claim
Fidelity: extraction-only package; refresh version and visible behavior unchanged

coordination/claims/M03-RND-M2-RUNTIME-MESH-FINALIZER-001.md

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+# M03-RND-M2-RUNTIME-MESH-FINALIZER-001 — M2 runtime mesh finalizer
+
+<!-- OPENWC_CLAIM:M03-RND-M2-RUNTIME-MESH-FINALIZER-001:sindo-main-codex:2026-07-20 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-m2-runtime-mesh-finalizer`
+- Lease expires UTC: 2026-07-20
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Extract stale cached-Mesh refresh classification, metadata adoption,
+M2Builder rebuild and fallback from `StreamingWorldLoader` into one runtime M2
+Mesh finalizer while retaining raw-file I/O in the loader.
+
+## Non-goals
+
+- Load raw `.m2` files, call FileAccess/ClassDB M2Loader or choose cache paths.
+- Own ResourceLoader requests, Mesh cache/missing state or MultiMesh builds.
+- Change material refresh version `2`, classifier predicates or rebuild behavior.
+- Change cache formats, profiles or visible output.
+
+## Paths
+
+- Exclusive: `src/render/m2/m2_runtime_mesh_finalizer.gd`,
+  `src/tools/verify_m2_runtime_mesh_finalizer.gd`,
+  `docs/modules/m2-runtime-mesh-finalizer.md`, this claim
+- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`, M2
+  classifier/extractor/cache/pipeline/material/shutdown verifiers and module
+  specs, `docs/modules/world-renderer.md`, `docs/modules/README.md`, `RENDER.md`,
+  `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated M2 resources, caches and
+  proprietary renderer corpus
+
+## Contracts and data
+
+- Refresh version remains `2`; already-current Meshes return unchanged without raw data.
+- Stale Meshes require caller-supplied raw data only when refresh is necessary.
+- Empty/ordinary raw data marks the original Mesh current and returns it.
+- Billboard/UV-rotation data attempts M2Builder rebuild and returns the rebuilt
+  first Mesh; rebuild failure marks and returns the original Mesh.
+- Classifier memoization retains both existing clear sites through finalizer clear.
+
+## Dependencies
+
+- Requires: accepted Mesh resource extractor package on master `dd8cfbf`
+- Blocks: further M2 raw-data I/O/prototype state extraction
+- External state: none; verification uses synthetic Mesh/raw-data fixtures
+
+## Verification
+
+- Commands: dedicated current/stale/ordinary/rebuild/fallback/clear/source/timing
+  verifier; classifier/extractor/cache/pipeline/material/shutdown/M2 build/facade/
+  internal-access/manifest, documentation and coordination gates
+- Fixtures: ArrayMesh and one synthetic triangle/billboard M2 Dictionary
+- Fidelity evidence: exact refresh version, predicate, rebuild and fallback transitions
+- Performance budget: 100 cycles over 256 ordinary finalizations under 1 second
+
+## Documentation deliverables
+
+- Inline public API docs
+- Module specification with inputs/outputs, ownership and source map
+- Data-flow, lifecycle/state, sequence and dependency diagrams
+- Classifier/extractor/cache/pipeline, world-renderer, registry and RENDER updates
+
+## Simplicity and naming
+
+- Important name introduced: `M2RuntimeMeshFinalizer`
+- Simplest solution: one service composing existing classifier/extractor and M2Builder
+- Rejected complexity: callbacks for loader I/O, generic material pipeline,
+  cache ownership, signals or strategy framework
+- Unavoidable complexity: two-phase raw-data request avoids loading raw files for current Meshes
+- Measured optimization evidence: bounded synthetic ordinary finalization loop
+
+## Status
+
+- State: claimed
+- Done: refresh, raw-data boundary, rebuild/fallback and both clear sites identified
+- Next: implement finalizer, migrate adapters, verify and document
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: