docs(M03): hand off M2 build batch planner

coordination/claims/M03-RND-M2-BUILD-BATCH-PLANNER-001.md

@@ -80,14 +80,26 @@ the loader build-job loop into a scene-free planner.
 
 ## Status
 
-- State: claimed
-- Done: formula, ownership and non-goal boundary published
-- Next: implement planner, migrate cursor calculation, tests and docs
+- State: handoff
+- Done: planner, loader adapter, regressions and documentation verified
+- Next: M03 integrator acceptance and merge to master
 - Blocked by:
 
+<!-- OPENWC_HANDOFF:READY:M03-RND-M2-BUILD-BATCH-PLANNER-001:be6db7f -->
+
 ## Handoff
 
-- Commit:
-- Results:
-- Remaining risks:
-- Documentation updated:
+- Commit: `be6db7f` (`refactor(M03): extract M2 build batch planner`)
+- Results: dedicated planner PASS (`cases=8`, `iterations=20000`,
+  `elapsed_ms=13.464`); grouper, transform resolver, M2 registry/dedupe, terrain
+  cache/LOD/queue, facade, internal-access, manifest, shutdown, scheduler,
+  streaming planner/focus, terrain-query and coordinate-boundary suites PASS;
+  editor import parsed with only expected missing private corpus diagnostics;
+  documentation PASS (`module_specs=18`, `required_files=7`); coordination PASS
+  with 23 pre-existing expired M00/M01 warnings; checkpoint dry-run planned `7/7`.
+- Remaining risks: no private asset-backed p95/p99 or visual comparison; result
+  and loader job remain Dictionaries; resource/queue transitions and spatial-cell
+  batching are still loader-owned; negative offset behavior remains permissive.
+- Documentation updated: inline public API; new
+  `docs/modules/m2-build-batch-planner.md`; placement grouper module spec,
+  renderer module registry, `docs/modules/world-renderer.md` and `RENDER.md`.