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+# M03-RND-FACADE-GROUND-QUERY-001 — Rendered ground query facade
+
+<!-- OPENWC_CLAIM:M03-RND-FACADE-GROUND-QUERY-001:sindo-main-codex:2026-07-18 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-facade-ground-query`
+- Lease expires UTC: 2026-07-18
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Expose typed ground-height sampling and a detached readiness diagnostic through
+`WorldRenderFacade`, using already loaded render terrain meshes, and migrate the
+terrain-height probe away from direct streamer state/queue access.
+
+## Non-goals
+
+- Replace the M02 gameplay-owned `TerrainQuery`/`AdtTerrainQuery` composition.
+- Make rendered mesh sampling authoritative for movement, collision or server state.
+- Add slopes, holes, liquid, WMO/M2 collision or async query callbacks.
+- Change terrain meshes, streaming policy, queue order, cache formats or visuals.
+- Complete environment/entity-visual facade contracts or mark M03 complete.
+
+## Paths
+
+- Exclusive: this claim
+- Shared/hotspots: `src/render/world_render_facade.gd`,
+  `src/scenes/streaming/streaming_world_loader.gd`,
+  `src/tools/probe_render_terrain_height.gd`,
+  `src/tools/verify_world_render_facade.gd`,
+  `src/tools/verify_renderer_internal_access.gd`, `docs/modules/world-renderer.md`,
+  `docs/modules/terrain-query.md`, `RENDER.md`, `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated ADT resource scripts,
+  extracted renderer corpus and probe reports
+
+## Contracts and data
+
+- Input: immutable `GodotWorldPosition` in Godot world units
+- Output: immutable `TerrainGroundSample` plus optional detached diagnostic Dictionary
+- Sampling source: loaded quality or tile-LOD Mesh and its live tile transform
+- M02 ADT query cache, renderer cache versions and coordinate contracts: unchanged
+
+## Dependencies
+
+- Requires: M02 terrain query contract and integrated M03 facade/access gate `53d84cc`
+- Blocks: removal of renderer diagnostic internal-access exception and later terrain service extraction
+- External state: asset-backed probe is optional; contract tests use a facade double
+
+## Verification
+
+- Commands: facade query/snapshot isolation contract, internal-access gate,
+  terrain-query regression, focus/coordinate/manifest/shutdown regressions and repository gates
+- Fixtures: available/unavailable sample, detached diagnostic, probe source migration
+- Fidelity evidence: mesh ray/nearest fallback algorithm moves unchanged from the probe
+- Performance budget: on-demand diagnostic query only; no per-frame query added
+
+## Documentation deliverables
+
+- Inline facade/streamer API docs
+- World-renderer API/data-flow/sequence/ownership/recovery/source-map updates
+- Terrain-query backend status/ownership clarification and renderer implementation note
+
+## Simplicity and naming
+
+- Important names: `sample_ground_height`, `renderer_ground_query_snapshot`
+- Simplest approach: one typed facade query over one existing diagnostic read model
+- Rejected complexity: duplicate ADT cache, physics service, callback bus, query node,
+  generic spatial interface or new dependency
+- Unavoidable complexity: triangle-mesh ray query retains the existing bounded
+  nearby fallback for seam/edge diagnostic behavior
+
+## Status
+
+- State: active
+- Done: facade/backend ownership and diagnostic compatibility contract defined
+- Next: move sampling behind loader/facade, migrate probe, add tests/docs
+- Blocked by: