coordination: claim animated M2 materializer

coordination/claims/M03-RND-M2-ANIMATED-INSTANCE-MATERIALIZER-001.md

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+# M03-RND-M2-ANIMATED-INSTANCE-MATERIALIZER-001
+
+<!-- OPENWC_CLAIM:M03-RND-M2-ANIMATED-INSTANCE-MATERIALIZER-001:sindo-main-codex:2026-07-20 -->
+
+## Owner
+
+- Agent ID: `sindo-main-codex`
+- Target: M03 Renderer Facade and Safe Extraction
+- Branch: `work/sindo-main-codex/m03-m2-animated-instance-materializer`
+- Worktree: `C:\Users\sindo\open-wc-worktrees\m03-m2-animated-instance-materializer`
+
+## Outcome
+
+Extract main-thread animated M2 instance duplication, render-property application,
+playback startup and batch attachment from `StreamingWorldLoader`.
+
+## Non-goals
+
+- Change build-job cursors, budgets, prototype selection or animation eligibility.
+- Change animation selection, phase, native animator behavior or diagnostic text.
+- Own Editor scene persistence, static MultiMesh materialization or tile cleanup.
+- Change visible transforms, visibility ranges, shadows or placement ordering.
+
+## Paths
+
+- Exclusive: `src/render/m2/m2_animated_instance_materializer.gd`,
+  `src/tools/verify_m2_animated_instance_materializer.gd`,
+  `docs/modules/m2-animated-instance-materializer.md`, this claim
+- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`, M2 animation
+  playback/finalizer/build/facade/internal-access/manifest verifiers and specs,
+  `docs/modules/world-renderer.md`, `docs/modules/README.md`, `RENDER.md`,
+  `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated resources/caches and proprietary corpus
+
+## Contracts and data
+
+- Duplicate flags, names, transforms and input order remain unchanged.
+- Visibility end/margin and shadow mode are applied recursively before attachment.
+- Playback data copy/start delegates to the accepted playback controller contract.
+- The batch is attached only when at least one duplicate succeeds.
+- Loader retains diagnostic formatting/path normalization and Editor ownership.
+
+## Dependencies
+
+- Requires: accepted playback package on master `5b2d9f2`
+- Blocks: further animated M2 build orchestration extraction
+- External state: Godot Node duplication and SceneTree attachment remain main-thread APIs
+
+## Verification
+
+- Commands: dedicated duplication/order/render/playback/empty/source/timing verifier;
+  M2 animated pipeline/finalizer/playback/prototype/build/shutdown/material/facade/
+  internal-access/manifest regressions; docs/coordination/dry-run gates
+- Fixtures: synthetic prototype trees with geometry, AnimationPlayer and native animator
+- Fidelity evidence: exact transforms, flags, render settings, playback delegation and order
+- Performance budget: 1,000 synthetic instances under 1 second
+
+## Documentation deliverables
+
+- Inline API docs
+- Module spec with inputs/outputs, ownership and source map
+- Data-flow, lifecycle/state, sequence and dependency diagrams
+- Adjacent playback/finalizer/build/world-renderer/module-registry/RENDER updates
+
+## Simplicity and naming
+
+- Important name introduced: `M2AnimatedInstanceMaterializer`
+- Simplest solution: synchronous main-thread RefCounted returning batch diagnostics
+- Rejected complexity: signals, async queue, callbacks and generic scene factory
+- Unavoidable complexity: imported AnimationPlayer and native animator paths coexist
+- Measured optimization evidence: bounded synthetic batch materialization
+
+## Status
+
+- State: active
+- Done: contract and ownership boundary
+- Next: implementation, verification and documentation
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: