coordination: hand off WMO runtime scene preparer

Work-Package: M03-RND-WMO-RUNTIME-SCENE-PREPARER-001
Agent: sindo-main-codex
Tests: documented in handoff
Fidelity: exact cached/live preparation behavior retained

coordination/claims/M03-RND-WMO-RUNTIME-SCENE-PREPARER-001.md

@@ -58,7 +58,28 @@ stateless main-thread service.
 
 ## Status
 
-- State: active
-- Done: scope and historical path distinction identified
-- Next: implement and verify subtree preparation delegation
+- State: ready
+- Done: implementation, verification and documentation
+- Next: integrator review and merge
 - Blocked by:
+
+## Handoff
+
+- Commit: `ffed91c` (`render: extract WMO runtime scene preparer`)
+- Results: preparer PASS `cases=31 iterations=1000 elapsed_ms=3.669`;
+  updated Mesh-finalizer boundary PASS `cases=28 iterations=1000
+  elapsed_ms=0.204`; headless suite `64/65` with no unexpected failures and
+  only the proprietary ADT placement probe unavailable without `data/extracted`;
+  editor parse had zero script diagnostics; checkpoint dry-run retained `7/7`;
+  documentation passed with `51` module specifications; coordination passed
+  with `77` historical expired-claim warnings.
+- Fidelity: cached/live preparation distinction, exact Mesh traversal order,
+  direct `Occluders` lookup/removal and enabled/preserved shadow semantics are
+  unchanged. No private-asset or original-client parity claim is added.
+- Remaining risks: recursive Resource/SceneTree mutation remains synchronous;
+  no asset-backed WMO portal/room, visual, leak/GPU or p95/p99 evidence.
+- Documentation: new full module specification with API/I/O and data-flow,
+  sequence/dependency diagrams; Mesh-finalizer ownership spec, renderer registry,
+  world-renderer source map and `RENDER.md` updated.
+
+<!-- OPENWC_HANDOFF:READY:M03-RND-WMO-RUNTIME-SCENE-PREPARER-001:ffed91c -->