create final nodes

agent/nodes/produceRanking.ts

@@ -0,0 +1,9 @@
+import { GraphNode } from "@langchain/langgraph";
+import { MessagesState } from "../state";
+import { AIMessage, HumanMessage } from "@langchain/core/messages";
+
+export const produceRanking: GraphNode<typeof MessagesState> = async (state) => {
+  //TODO: produce ranking here
+  
+  return { messages: [ new AIMessage(state.messages?.length.toString() ?? "0")] };
+};