gmp(M02): extract player terrain query

Work-Package: M02-GMP-TERRAIN-QUERY-001
Agent: sindo-main-codex
Tests: terrain query, player input and movement regressions; asset-free scene; renderer dry-run; coordinate, streaming, documentation and coordination gates
Fidelity: preserves existing ADT outer-grid interpolation and player ground snap; build-12340 collision parity remains unverified

coordination/claims/M02-GMP-TERRAIN-QUERY-001.md

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+# M02-GMP-TERRAIN-QUERY-001 — Player terrain query boundary
+
+<!-- OPENWC_CLAIM:M02-GMP-TERRAIN-QUERY-001:sindo-main-codex:2026-07-16 -->
+
+## Ownership
+
+- Target: M02
+- Program: GMP/RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m02-terrain-query`
+- Lease expires UTC: 2026-07-16
+- Integrator: M02 milestone integrator
+
+## Outcome
+
+Introduce a typed `TerrainQuery` boundary and move ADT loading, caching, chunk
+selection and height interpolation out of `ThirdPersonWowController` without
+changing current spawn/ground-snap behavior.
+
+## Non-goals
+
+- Change ADT topology, coordinate formulas, terrain mesh or renderer caches.
+- Add physics collision, slopes, water, jump/fall/swim or server movement.
+- Reuse the streaming renderer cache before its public terrain-query contract exists.
+- Extract camera or character presentation.
+- Mark M02 complete or edit its checklist/Evidence.
+
+## Paths
+
+- Exclusive: `src/gameplay/terrain/`, `src/tools/verify_terrain_query.gd`,
+  `docs/modules/terrain-query.md`, this claim
+- Shared/hotspots: `src/scenes/player/third_person_wow_controller.gd`,
+  `src/tools/verify_player_input.gd`,
+  `src/tools/verify_coordinate_conversion_boundaries.gd`,
+  `docs/modules/local-player-movement.md`,
+  `docs/modules/README.md`
+- Generated/ignored: local `.godot`, native DLL, generated ADT resources and renderer corpus
+
+## Contracts and data
+
+- Public API: `TerrainQuery.sample_ground_height(GodotWorldPosition)` returning
+  immutable `TerrainGroundSample`
+- Production adapter: `AdtTerrainQuery` with owned per-tile parse cache
+- Test/data-source seam: optional ADT tile loader callable at construction
+- Coordinate contract version, ADT format, renderer cache and persistence: unchanged
+- Consumers: current player scene; future movement/collision policies
+
+## Dependencies
+
+- Requires: merged movement controller on master `5206c42`
+- Blocks: camera/presentation extraction from the player hotspot
+- External state: production uses existing native `ADTLoader`; synthetic tests need no proprietary data
+
+## Verification
+
+- Commands: synthetic height/cache/failure verifier, player input/movement
+  regressions, asset-free scene, coordinate/StreamingFocus gates, renderer dry-run
+  and repository gates
+- Fixtures: synthetic 145-height chunk payload and injected flat terrain query
+- Fidelity evidence: preserves existing outer-grid bilinear interpolation,
+  spawn ground offset and per-tick snap formula only
+- Performance budget: one cached tile lookup and local interpolation per ground query;
+  no new I/O after first tile load
+
+## Documentation deliverables
+
+- Inline public API docs for query, sample and ADT adapter
+- Terrain-query module spec with inputs/outputs, data-flow, cache lifecycle and sequence diagrams
+- Updated movement/coordinate consumer boundaries, source maps and module registry
+
+## Simplicity and naming
+
+- Important names: `TerrainQuery`, `TerrainGroundSample`, `AdtTerrainQuery`
+- Simplest approach: one narrow query contract, one typed result and one existing-format adapter
+- Rejected complexity: general collision framework, terrain service locator and renderer-cache coupling
+- Unavoidable complexity: ADT 145-height layout and chunk lookup stay isolated in adapter
+- Measured optimization evidence: existing per-tile cache retained; no new optimization
+
+## Status
+
+- State: active
+- Done: claim and isolated worktree from updated master
+- Next: implement contract/adapter, migrate player, test and document
+- Blocked by: