Gateway: show subagent requests on the parent's card, and settle threads

gateway/src/t3/types.ts

@@ -182,6 +182,7 @@ export type Command =
       answers?: Record<string, unknown>;
     }
   | { type: "thread.stop"; commandId: string; threadId: string }
+  | { type: "thread.settle"; commandId: string; threadId: string }
   | { type: "run.interrupt"; commandId: string; threadId: string; runId: string };
 
 export interface LaunchThreadInput {