LangGraph Flow Engineering: Interrupt-and-Resume as a First-Class Bounded Autonomy Pattern

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LangGraph's 2026 production maturity has crystallized flow engineering — treating agent construction as a software architecture problem with typed state, conditional edges, and explicit interrupt points — as the dominant agentic design discipline. The interrupt and resume model lets any graph node pause, surface current state to a human or another agent, and resume from an exact checkpoint, enabling bounded autonomy without hard-coding approval gates into business logic. Teams using this pattern report measurably higher task completion on multi-session benchmarks versus agents without structured resumability.