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* fix(gateway): keep LangGraph checkpoint keys out of client thread metadata POST /api/threads spread client metadata over the root checkpoint's step/source/writes/parents. A non-mapping parents broke every history read and a non-integer step broke every later turn, leaving deletion as the only way out. Server values now come after the client's. * docs(changelog): reference #8019 for thread-create checkpoint metadata * fix(gateway): keep server-owned checkpoint keys out of client thread metadata The root checkpoint still copied client keys the server reads back as trusted. A non-mapping counters_since_delta_snapshot failed every state update and turn in both checkpoint modes, and deerflow_agent_name was copied into the next state rewrite as the server-authored agent binding. Drop a named set of checkpoint-owned keys before the spread so the fix no longer relies on dict ordering alone. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>