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+# M03-RND-M2-UNIQUE-REGISTRY-001 — M2 unique placement registry
+
+<!-- OPENWC_CLAIM:M03-RND-M2-UNIQUE-REGISTRY-001:sindo-main-codex:2026-07-19 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-m2-unique-registry`
+- Lease expires UTC: 2026-07-19
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Extract cross-tile positive `MDDF.uniqueId` reservation ownership from the
+streamer into a scene-free `M2UniquePlacementRegistry`.
+
+## Non-goals
+
+- Move tile state, candidate requeue, group/build tasks or result queues.
+- Move MultiMesh/Node/Mesh/material creation, animation or resource loading.
+- Change unique-key format, first-owner semantics or unkeyed placement behavior.
+- Change placement transforms, detail radius, cache versions or quality profiles.
+- Add dependencies or mark the broad M2 service complete.
+
+## Paths
+
+- Exclusive: `src/render/m2/m2_unique_placement_registry.gd`,
+  `src/tools/verify_m2_unique_placement_registry.gd`,
+  `docs/modules/m2-unique-placement-registry.md`, this claim
+- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`,
+  `docs/modules/world-renderer.md`, `docs/modules/README.md`, `RENDER.md`,
+  `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated ADT resources, caches and
+  proprietary renderer corpus
+
+## Contracts and data
+
+- Input: tile key and raw ADT M2 placement dictionaries
+- Reserve output: fresh filtered placements, owned unique keys and skipped keys
+- Release input/output: tile key plus claimed keys; only current owner releases
+- Positive IDs map to `uid:<decimal>`; zero/negative/missing IDs remain untracked
+- Registry is session-memory only and clears on renderer world reset
+- Queue/cache/schema/coordinate versions: unchanged
+
+## Dependencies
+
+- Requires: current master `57ae1b8`
+- Blocks: broader M2 service extraction and dependency/performance acceptance
+- External state: none; tests use synthetic placement dictionaries
+
+## Verification
+
+- Commands: dedicated unkeyed/duplicate/cross-tile/release/clear/detached-
+  diagnostic and bounded timing verifier; loader source boundary; M2 unique-id
+  smoke plus facade/terrain/internal-access/manifest/shutdown/scheduler gates
+- Fidelity evidence: exact positive-ID key format and first-owner/retry behavior
+- Performance budget: dictionary membership over placement count; no Node,
+  Resource, RID, task, file or persistent cache
+
+## Documentation deliverables
+
+- Inline registry API documentation
+- New module spec with inputs/outputs, data-flow, lifecycle, sequence, ownership,
+  failure, recovery, performance and source map
+- World renderer/module registry/`RENDER.md` updates
+
+## Simplicity and naming
+
+- Important name: `M2UniquePlacementRegistry`
+- Simplest solution: one private key-to-owner dictionary and explicit operations
+- Rejected complexity: generic identity registry, signals, callbacks, Resources,
+  locks or ownership graph
+- Unavoidable complexity: raw placement dictionaries remain at ADT adapter boundary
+- Measured optimization evidence: bounded synthetic reserve/release verifier
+
+## Status
+
+- State: claimed
+- Done: scope, key semantics and ownership published
+- Next: implement registry, migrate loader adapters, tests and docs
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: