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A graph using `DeltaChannel` reconstructs state via the saver's `get_delta_channel_history` API (added in `langgraph-checkpoint>=4.1.0`). Savers from older packages lack it and fail at runtime. `StateGraph.compile` now warns at compile time so users know to upgrade `langgraph-checkpoint`. Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>