Directed graph framework for building stateful, multi-step agent workflows with fine-grained control.

• ›StateGraph with typed state schemas, reducers for accumulating lists/values, and nodes that return partial state updates
• ›Static edges for fixed flow, conditional edges for branching, and Command for combining state updates with dynamic routing
• ›Send API for fan-out parallelism to worker nodes with result aggregation via reducers
• ›Invoke for single execution and stream modes (values,