lifecycle: thread on_step callback through rebuild for accurate queue step labels

hive-c0re/src/auto_update.rs

@@ -86,7 +86,6 @@ pub async fn rebuild_agent(
     // lifecycle_action; this catches the auto-update scan + any
     // other direct caller.
     let guard = coord.transient_guard(name, crate::coordinator::TransientKind::Rebuilding);
-    coord.set_queue_step(queue_entry_id, "nixos-container update");
     let result = lifecycle::rebuild(
         name,
         &coord.hyperhive_flake,
@@ -97,6 +96,7 @@ pub async fn rebuild_agent(
         coord.dashboard_port,
         &coord.operator_pronouns,
         &coord.context_window_tokens,
+        &|step| coord.set_queue_step(queue_entry_id, step),
     )
     .await;
     drop(guard);