feat: add workflow action outcomes and tracing

frontend/src/lib/api.ts

@@ -278,6 +278,14 @@ export type ConversationMessage = {
 };
 
 export type ConversationDetail = Conversation & {
+  extra: {
+    workflow?: {
+      revision: string;
+      specVersion?: number;
+      snapshot: Record<string, unknown>;
+    };
+    workflowTrace?: Array<Record<string, unknown>>;
+  };
   messages: ConversationMessage[];
 };