Continue Plan Execution

Continue a plan execution that's waiting for user input. This endpoint: 1. Accepts batch responses for multiple waiting tasks 2. Sends messages to each agent execution 3. Restarts the workflow to continue plan execution Body: { "responses": [ { "execution_id": "agent-exec-abc-123", "message": "5 + 3" }, { "execution_id": "agent-exec-xyz-456", "message": "Calculate for today" } ] }