hivectl: migrate dag_progress to hive-jobq-wire's generic GraphNode

hive-c0re/src/server.rs

@@ -160,6 +160,7 @@ async fn dispatch(req: &HostRequest, coord: Arc<Coordinator>) -> HostResponse {
                     .collect();
                 HostResponse::dags(dags)
             }
+            HostRequest::QueueNodes { id } => HostResponse::nodes(coord.job_queue.dag_nodes(*id)),
             HostRequest::List => HostResponse::list(lifecycle::list().await?),
             // The agents root is ours and not world-traversable, so this
             // question is only answerable on this side of the socket —