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Infer the node names from a compiled graph.
Extracts the ~NodeType phantom property from CompiledGraph instances,
providing a union of all node names defined in the graph.
const graph = new StateGraph(StateAnnotation)
.addNode("agent", agentFn)
.addNode("tool", toolFn)
.compile();
type NodeNames = InferNodeNames<typeof graph>; // "agent" | "tool"