refactor(#2591): make NodeKind the queue payload — drop JobPayload, agent into variants

hive-c0re/src/workers/auto_update.rs

@@ -325,7 +325,6 @@ fn submit_boot_tree(
     // MetaLock into `run_meta_lock`, which appends the rebuild subgraphs.
     if any_stale {
         nodes.push(NodeSpec {
-            agent: "hyperhive".to_owned(),
             kind: NodeKind::MetaLock {
                 sweep: true,
                 fanout: Some(fanout),
@@ -337,8 +336,7 @@ fn submit_boot_tree(
     // One boot Reconcile per drifted agent — independent roots.
     for name in drifted {
         nodes.push(NodeSpec {
-            agent: name,
-            kind: NodeKind::Reconcile,
+            kind: NodeKind::Reconcile { agent: name },
             deps: Vec::new(),
             parent: None,
         });