docs(M03): accept M2 placement grouper

coordination/claims/M03-RND-M2-PLACEMENT-GROUPER-001.md

@@ -81,12 +81,13 @@ grouping from the worker callback into a scene-free service.
 
 ## Status
 
-- State: handoff
+- State: accepted
 - Done: pure grouper, worker adapter, regressions and documentation verified
-- Next: M03 integrator acceptance and merge to master
+- Next: M2 worker/build state extraction and spatial-cell evidence
 - Blocked by:
 
 <!-- OPENWC_HANDOFF:READY:M03-RND-M2-PLACEMENT-GROUPER-001:9df32d3 -->
+<!-- OPENWC_INTEGRATION:ACCEPTED:M03-RND-M2-PLACEMENT-GROUPER-001:f88bf97 -->
 
 ## Handoff
 
@@ -107,3 +108,7 @@ grouping from the worker callback into a scene-free service.
 - Documentation updated: inline public API; new
   `docs/modules/m2-placement-grouper.md`; transform resolver module spec,
   renderer module registry, `docs/modules/world-renderer.md` and `RENDER.md`.
+- Integration: accepted in master merge `f88bf97`; post-merge grouper
+  (`cases=9`, `iterations=100`, `placements=256`, `elapsed_ms=67.104`),
+  transform resolver, registry, internal-access, facade, manifest,
+  documentation and coordination gates passed.