feat(#2392): group boot sweep + reconciles under one boot dag

hive-c0re/src/job_queue/exec.rs

@@ -94,6 +94,9 @@ pub(super) async fn run_node(coord: &Arc<Coordinator>, claim: &Claim) -> Result<
         NodeKind::WriteDropin => run_write_dropin(coord, claim).await,
         NodeKind::WritePermFile => run_write_perm_file(coord, claim, &ctx).await,
         NodeKind::ApprovalDeploy => run_approval_deploy(coord, claim).await,
+        // A pure grouping anchor (boot root): no work, completes immediately so
+        // its child DAGs settle it and the boot tree resolves.
+        NodeKind::Noop => Ok(NodeOutput::default()),
     }
 }