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- Add DeltaValue to SAFE_MSGPACK_TYPES so SQLite and other msgpack-based savers don't emit "Deserializing unregistered type" warnings. - Rename _is_diff_delta → _is_delta_value (leftover from DiffChannel rename). - Parametrize benchmark by checkpointer: runs InMemory (fast-path) and SQLite (get_tuple fallback) in the same table, sharing the _run_turns helper. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>