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Build LangGraph State Graph
Linked challenge: LangChain LangGraph Process Digital Twin Sync & Flowmeter Calibration Agent
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Import StateGraph, END from langgraph.graph. Define a TypedDict state flow with fields 'measured_flow', 'twin_flow', 'drift_pct', and 'action'. Create nodes for 'calculate_drift' and 'recalibrate_sensor'.