Add ROBERTA classifier ranking PoC, with 77pc off the bat

agent/nodes/produceRanking.ts

@@ -3,7 +3,7 @@ import { MessagesState } from "../state";
 import { BaseMessage } from "@langchain/core/messages";
 
 //TODO: Each of these might need different weights
-const keys = ["CONFIDENCE", "RAGAS", "RELATION"];
+const keys = ["CONFIDENCE", "RELATION", "RAGAS", "ROBERTA"];
 
 const mapping = {
   VERYHIGH: 1.0,
@@ -16,7 +16,7 @@ const mapping = {
 type Priority = keyof typeof mapping;
 
 function mapResponse(value: string | undefined | null): number {
-  if (!value) return 0;
+  if (!value) return 1;
 
   const trimmed = value.trim();
   const num = parseFloat(trimmed);

agent/nodes/robertaMetrics.ts

@@ -0,0 +1,14 @@
+import { GraphNode } from "@langchain/langgraph";
+import { MessagesState } from "../state";
+import { AIMessage } from "@langchain/core/messages";
+import { evaluateWithRoberta } from "../tools/robertaCall";
+
+export const robertaMetrics: GraphNode<typeof MessagesState> = async (state) => {
+  const answer = state.proposedTriggerEvent[state.proposedTriggerEventIndex].Event
+  
+  const result = await evaluateWithRoberta({answer})
+  
+  return {
+    messages: [ new AIMessage("ROBERTA:" + result)]
+  };
+};