test(#2591): assert hivectl header shows source, not a derived label

hivectl/src/dag_progress.rs

@@ -337,10 +337,12 @@ mod tests {
     }
 
     #[test]
-    fn render_dag_line_shows_chain_with_derived_label_and_state() {
-        // Roll-up state (Running) + label ("rebuild") are derived from the node
-        // set — the wire no longer carries them. (`Done` nodes are included
-        // here to exercise glyph rendering; production filters them off.)
+    fn render_dag_line_shows_source_and_chain() {
+        // The header shows what the backend sends: the roll-up state glyph
+        // (derived — Running here) + the DAG `source` ("manual"); the operation
+        // is read off the node chain, not a client-side label. (`Done` nodes
+        // are included here to exercise glyph rendering; production filters
+        // them off.)
         let dag = DagView {
             id: 7,
             source: Source::Manual,
@@ -356,7 +358,7 @@ mod tests {
             ],
         };
         let line = render_dag_line(&dag);
-        assert!(line.starts_with("▶ rebuild alice"), "{line}");
+        assert!(line.starts_with("▶ manual alice"), "{line}");
         assert!(
             line.contains("✔ prebuild → ✔ stop_for_update → ▶ swap → ⏸ reconcile"),
             "{line}"
@@ -377,7 +379,7 @@ mod tests {
             nodes: vec![failed],
         };
         let line = render_dag_line(&dag);
-        assert!(line.contains("✖ rebuild"), "{line}");
+        assert!(line.contains("✖ manual"), "{line}");
         assert!(line.contains("— nix build exploded"), "{line}");
     }
 }