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Make the ThreadStore contract coherent: append_items is now a raw canonical history append, and update_thread_metadata is the single metadata write API. ThreadStore implementations no longer infer metadata by inspecting appended rollout items. LiveThread now owns the live append flow. It applies the rollout persistence policy before writing JSONL history, observes the canonical items with a small ThreadMetadataSync helper, and sends the derived facts back through update_thread_metadata. ThreadManager becomes the single app-facing metadata entrypoint, routing loaded threads through LiveThread and cold threads directly to the store. LocalThreadStore preserves the local compatibility requirements inside the local implementation. SQLite, when available, receives explicit metadata updates. JSONL and name-index compatibility are still maintained for explicit metadata mutations such as rename, memory-mode, and git changes, so old rollout files and SQLite-less local storage remain readable. RolloutRecorder is reduced to local JSONL writing for thread-store appends. The shared rollout persistence policy remains in codex-rollout, but recorder no longer owns live metadata synthesis. The added thread-store README captures the new ownership boundaries for future remote and local implementations.