fix: consume prompt on first poll read to prevent duplicate dispatch

The GET endpoint now clears the prompt from the session after the first
read. Subsequent polls see status "picked" but no prompt, so even if
multiple fetches are in flight only the first one gets the prompt to
send to the agent.

Author: NathanTarbert

apps/app/src/app/api/pick/route.ts

@@ -9,6 +9,13 @@ export async function GET(req: NextRequest) {
   const session = getSession(sessionId);
   if (!session) return NextResponse.json({ status: "waiting" });
 
+  // Consume the prompt on first read so duplicate polls don't re-trigger
+  if (session.status === "picked" && session.prompt) {
+    const prompt = session.prompt;
+    setSession(sessionId, { status: "picked" });
+    return NextResponse.json({ status: "picked", prompt });
+  }
+
   return NextResponse.json(session);
 }