coord(M03): hand off facade ground query

coordination/claims/M03-RND-FACADE-GROUND-QUERY-001.md

@@ -75,7 +75,36 @@ terrain-height probe away from direct streamer state/queue access.
 
 ## Status
 
-- State: active
+- State: ready-for-review
-- Done: facade/backend ownership and diagnostic compatibility contract defined
+- Done: added renderer-owned typed sample, facade query/snapshot, migrated terrain
-- Next: move sampling behind loader/facade, migrate probe, add tests/docs
+  probe, expanded internal-access/coordinate gates and updated module docs
+- Next: M03 integrator reviews and merges `b697a89`
 - Blocked by:
+
+<!-- OPENWC_HANDOFF:READY:M03-RND-FACADE-GROUND-QUERY-001:b697a89 -->
+
+## Handoff
+
+- Commit: `b697a89`
+- Results: `WorldRenderFacade` delegates loaded-mesh ground sampling and returns
+  renderer-owned `RenderedGroundSample`; detached diagnostic snapshots preserve
+  the probe report while hiding queue/tile/Mesh/Node references. Gameplay remains
+  on the independent M02 `TerrainQuery` composition.
+- Verification: facade `delegation=5 ground_contract=2 runtime_scenes=2 tools=3`;
+  internal access `private_symbols=43 gameplay=7 editor_sources=9 renderer_tools=1`;
+  terrain query contracts passed; coordinate boundary `files=113 consumers=5`;
+  renderer manifest `7/7`; shutdown ownership, scheduler/planner, coordination,
+  documentation and diff gates passed.
+- Fidelity: the probe's 5000-unit ray height, 3x3 tile search, highest-hit choice,
+  readiness fields and `2/5/10/20/40` nearby fallback moved unchanged. No terrain
+  geometry, streaming, cache, material, placement or visual rule changed. No
+  build-12340 parity claim is added.
+- External/local inputs: ignored native DLL and generated ADT resource scripts
+  were copied from master only for editor/streamer parse and then removed.
+  Proprietary extracted world data was unavailable, producing expected degraded diagnostics.
+- Remaining risks: triangle-mesh generation is on-demand/main-thread and diagnostic;
+  it is unsuitable for per-physics-frame gameplay; exact asset-backed probe output
+  still depends on local corpus readiness; environment/entity facade contracts remain.
+- Documentation: inline facade/loader/value API; world-renderer API/data-flow/
+  sequence/ownership/recovery/capability/source map; terrain-query authority
+  clarification and renderer implementation notes updated.