feat(adapters/langgraph): run a Swarm as a flow step#20
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Symmetric with the ManagerWorkers flow-step support. A Swarm is an AgenticComponent, not an Agent, so an AgentNode wrapping one previously raised TypeError in AgentNodeExecutor and exposed no input ports (a DataFlowEdge into the node could not resolve at load). - Swarm._get_inferred_inputs/_get_inferred_outputs expose the entry agent's (first_agent) ports, mirroring ManagerWorkers' group manager, so an AgentNode wrapping a Swarm declares inputs and data edges into it resolve at load. - AgentNodeExecutor now dispatches a Swarm flow step: it renders the node inputs into the entry agent's prompt (swapping the rendered agent into both first_agent and the relationship tuples), drops the satisfied input ports, compiles via _swarm_convert_to_langgraph and drives the graph over messages. Adds tests/adapters/langgraph/flows/test_swarm_node.py.
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Symmetric with the ManagerWorkers flow-step support. A Swarm is an AgenticComponent, not an Agent, so an AgentNode wrapping one previously raised TypeError in AgentNodeExecutor and exposed no input ports (a DataFlowEdge into the node could not resolve at load).
Adds tests/adapters/langgraph/flows/test_swarm_node.py.