docs(M03): hand off M2 mesh resource extractor

Work-Package: M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001
Agent: sindo-main-codex
Tests: 36 headless regressions, checkpoint dry-run, documentation and coordination gates pass
Fidelity: traversal/lifetime extraction only; asset-backed visual parity remains unclaimed

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

@@ -78,14 +78,23 @@ including temporary PackedScene instance cleanup, from `StreamingWorldLoader`.
 
 ## Status
 
-- State: claimed
-- Done: three first-Mesh call sites and temporary PackedScene lifecycle identified
-- Next: implement extractor, migrate loader adapters, verify and document
+- State: ready
+- Done: extractor, three loader/test adapters, contract verifier and required documentation
+- Next: integrator merge and post-merge smoke
 - Blocked by:
 
 ## Handoff
 
-- Commit:
-- Results:
-- Remaining risks:
-- Documentation updated:
+- Commit: `7b0e1ea`
+- Results: extractor passes direct/PackedScene/subtree/order/lifetime contracts
+  and 10,000 traversals in 39.243 ms; 36 headless renderer/coordinate
+  regressions pass; checkpoint dry-run passes 7/7; documentation and
+  coordination gates pass.
+- Remaining risks: synchronous PackedScene instantiation remains behind the
+  existing permit; no private M2 corrupt-scene/traversal/leak/p95/p99 or
+  original-client comparison; material preparation remains loader-owned.
+- Documentation updated: inline API; `m2-mesh-resource-extractor.md` with
+  data-flow, lifecycle, sequence and dependency diagrams; cache/pipeline specs,
+  module registry, `world-renderer.md` and `RENDER.md`.
+
+<!-- OPENWC_HANDOFF:READY:M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001:7b0e1ea -->