coord(M03): claim M2 mesh resource extractor

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

coordination/claims/M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001.md

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+# M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001 — M2 mesh resource extractor
+
+<!-- OPENWC_CLAIM:M03-RND-M2-MESH-RESOURCE-EXTRACTOR-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-mesh-resource-extractor`
+- Lease expires UTC: 2026-07-20
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Extract first-Mesh selection from loaded M2 Resources and Node subtrees,
+including temporary PackedScene instance cleanup, from `StreamingWorldLoader`.
+
+## Non-goals
+
+- Call ResourceLoader or select/request cache paths.
+- Refresh/rebuild materials or load raw M2 data.
+- Own the Mesh cache, missing state, prototypes or MultiMesh materialization.
+- Change traversal order, cache formats, profiles or visible behavior.
+
+## Paths
+
+- Exclusive: `src/render/m2/m2_mesh_resource_extractor.gd`,
+  `src/tools/verify_m2_mesh_resource_extractor.gd`,
+  `docs/modules/m2-mesh-resource-extractor.md`, this claim
+- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`,
+  M2 pipeline/cache/material/shutdown verifiers, `docs/modules/world-renderer.md`,
+  `docs/modules/README.md`, M2 module specs, `RENDER.md`,
+  `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated M2 resources, caches and
+  proprietary renderer corpus
+
+## Contracts and data
+
+- A direct Mesh Resource returns the same Mesh reference.
+- A PackedScene is instantiated once, searched depth-first in child order and
+  its temporary root is freed before return.
+- A Node subtree search returns the first MeshInstance3D Mesh in historical
+  depth-first preorder without changing the tree.
+- Null, unsupported Resources and subtrees without a Mesh return null.
+
+## Dependencies
+
+- Requires: accepted Mesh resource cache package on master `5e2afbc`
+- Blocks: isolated material refresh/rebuild finalizer extraction
+- External state: none; verification uses synthetic Mesh/Node/PackedScene fixtures
+
+## Verification
+
+- Commands: dedicated direct/PackedScene/subtree/order/lifetime/source/timing
+  verifier; M2 pipeline/cache/classifier/material/shutdown/build/facade/internal-
+  access/manifest, documentation and coordination gates
+- Fixtures: ArrayMesh, MeshInstance3D subtrees and synthetic PackedScene
+- Fidelity evidence: exact traversal order and temporary-node destruction
+- Performance budget: 10,000 synthetic subtree lookups 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
+- M2 cache/pipeline, world-renderer, registry and RENDER updates
+
+## Simplicity and naming
+
+- Important name introduced: `M2MeshResourceExtractor`
+- Simplest solution: one stateless RefCounted with two explicit extraction APIs
+- Rejected complexity: callback-driven finalizer, generic scene utility,
+  cache ownership, signals or visitor framework
+- Unavoidable complexity: temporary PackedScene instance must be freed while
+  its referenced Mesh remains borrowed
+- Measured optimization evidence: bounded synthetic depth-first traversal
+
+## Status
+
+- State: claimed
+- Done: three first-Mesh call sites and temporary PackedScene lifecycle identified
+- Next: implement extractor, migrate loader adapters, verify and document
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: