feat(agent): Implement recursion limit handling and emergency synthesis for search process

src/lib/agents/agentState.ts

@@ -74,4 +74,8 @@ export const AgentState = Annotation.Root({
     reducer: (x, y) => y ?? x,
     default: () => '',
   }),
+  recursionLimitReached: Annotation<boolean>({
+    reducer: (x, y) => y ?? x,
+    default: () => false,
+  }),
 });