rayhpeng b2ec1f99b9 feat(persistence): unify ThreadMetaStore interface with user isolation and factory
Add user_id parameter to all ThreadMetaStore abstract methods. Implement
owner isolation in MemoryThreadMetaStore with _get_owned_record helper.
Add check_access to base class and memory implementation. Add
make_thread_store factory to simplify deps.py initialization. Add
memory-backend isolation tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-11 23:38:19 +08:00
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