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precursor to `prepare_call` PR, cleaning up existing logic w/ pre model hook * use one combined `AgentState` instead of the one w/ and w/o structured response * remove exposed pydantic agent state + loosen bounds on state type * remove llm input messages pattern, should be made possible with prepare_call also * some remaining test fixes in `langgraph` to adapt to new `model` node name (used to be `agent`)