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+# M03-RND-M2-RUNTIME-REBUILD-CLASSIFIER-001 — M2 runtime rebuild classifier
+
+<!-- OPENWC_CLAIM:M03-RND-M2-RUNTIME-REBUILD-CLASSIFIER-001:sindo-main-codex:2026-07-20 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-m2-runtime-rebuild-classifier`
+- Lease expires UTC: 2026-07-20
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Extract the memoized decision that stale cached M2 meshes require an in-memory
+runtime rebuild because raw batches contain billboard vertices or referenced UV
+rotation transforms.
+
+## Non-goals
+
+- Load raw M2 files or cache Resources.
+- Build, replace or mutate Meshes, materials, Nodes or RIDs.
+- Change `M2_MATERIAL_REFRESH_VERSION` or cache formats.
+- Interpret animation, particles, ribbons or general M2 shader fidelity.
+- Change path normalization, ResourceLoader transitions or finalize budgets.
+
+## Paths
+
+- Exclusive: `src/render/m2/m2_runtime_mesh_rebuild_classifier.gd`,
+  `src/tools/verify_m2_runtime_mesh_rebuild_classifier.gd`,
+  `docs/modules/m2-runtime-mesh-rebuild-classifier.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/M2 resources, caches
+  and proprietary renderer corpus
+
+## Contracts and data
+
+- Billboard metadata requires rebuild when `has_billboard` is true or
+  `billboard_vertex_count` is positive in any Dictionary batch.
+- UV rotation requires non-empty transforms and combos plus a referenced
+  non-identity `Vector4` rotation or absolute rotation speed above `0.000001`.
+- Only up to four texture stages per batch are inspected; invalid variants and
+  out-of-range combo/transform indices are skipped.
+- The first decision for a normalized path is memoized until clear, matching the
+  existing loader cache lifetime.
+
+## Dependencies
+
+- Requires: current accepted master `90b1dac`
+- Blocks: further M2 mesh request/cache/finalization extraction
+- External state: none; verification uses synthetic raw M2 Dictionaries
+
+## Verification
+
+- Commands: dedicated billboard/UV/index/stage/cache/clear/source/timing verifier;
+  M2 builder/grouper/transform/registry, materials, shutdown, facade,
+  internal-access, manifest, documentation and coordination gates
+- Fixtures: synthetic batches, transform combos and rotation dictionaries
+- Fidelity evidence: exact existing predicate thresholds, stage cap and cache lifetime preserved
+- Performance budget: 100 classifications over 256 paths under 1 second
+
+## Documentation deliverables
+
+- Inline public API docs
+- Module specification with inputs/outputs, ownership and source map
+- Data-flow, lifecycle/state, sequence and dependency diagrams
+- World-renderer, module registry and RENDER status updates
+
+## Simplicity and naming
+
+- Important names introduced: `M2RuntimeMeshRebuildClassifier`
+- Simplest considered solution: one RefCounted with one memoized query and clear
+- Rejected complexity/abstractions: generic predicate cache, strategy interface,
+  ResourceLoader wrapper, signals or typed rewrite of raw parser Dictionaries
+- Unavoidable complexity and justification: four-stage combo indirection is the
+  existing build-12340 M2 material boundary
+- Measured optimization evidence: bounded synthetic classification loop
+
+## Status
+
+- State: claimed
+- Done: rebuild predicate, one query site and two cache-clear sites identified
+- Next: implement classifier, migrate loader adapter, verify and document
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: