docs(M03): hand off M2 mesh resource cache state

Work-Package: M03-RND-M2-MESH-RESOURCE-CACHE-001
Agent: sindo-main-codex
Tests: 35 headless regressions, checkpoint dry-run, documentation and coordination gates pass
Fidelity: cache ownership/lifetime extraction only; asset-backed visual parity remains unclaimed

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

@@ -78,14 +78,22 @@ all existing cache consumers.
 
 ## Status
 
-- State: claimed
-- Done: all Mesh cache read/write/clear sites identified
-- Next: implement cache state, migrate adapters, verify and document
+- State: ready
+- Done: cache state, 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: `e990a65`
+- Results: dedicated cache verifier passes 100-by-256 store/lookups in
+  38.974 ms; 35 headless renderer/coordinate regressions pass; checkpoint
+  dry-run passes 7/7; documentation and coordination gates pass.
+- Remaining risks: no private M2 traversal, Mesh memory/leak/descriptor-pressure
+  run or original-client visual comparison; extraction/preparation, shared
+  missing state and materialization remain loader-owned by design.
+- Documentation updated: inline API; `m2-mesh-resource-cache-state.md` with
+  data-flow, lifecycle, sequence and dependency diagrams; pipeline spec, module
+  registry, `world-renderer.md` and `RENDER.md`.
+
+<!-- OPENWC_HANDOFF:READY:M03-RND-M2-MESH-RESOURCE-CACHE-001:e990a65 -->