hive-c0re/hivectl/hive-agent: pause as a job-queue DAG node (closes #3056)

hive-c0re/src/job_queue/tests.rs

@@ -1587,6 +1587,47 @@ fn graceful_stop_shape_signal_drain_reconcile() {
     );
 }
 
+#[test]
+fn pause_shape_signal_drain() {
+    let q = JobQueue::new(1);
+    insert(&q, |builder| {
+        power::pause_nodes(builder, &["agent-a".to_owned()]);
+    });
+    assert_eq!(
+        declared_shape(&q),
+        vec![
+            // Unlike the stop quiesce pair (which hangs under an existing
+            // `set_wanted` head), pausing has no natural parent to reuse, so
+            // this shape declares its own `AgentWindow` brace — the pair are
+            // plain siblings under it, not a signal-holds-the-lease-itself
+            // shape (that was tried first and rejected at insert: a child
+            // can't `after_ok` its own parent — see `pause_quiesce`'s doc
+            // comment for the exact error).
+            row("agent_window", None, &[]),
+            row("pause_signal", Some("agent_window"), &[]),
+            row(
+                "pause_drain",
+                Some("agent_window"),
+                &[("pause_signal", "done")]
+            ),
+        ]
+    );
+    assert_eq!(
+        declared_resources(&q, node_of(&q, "agent_window")),
+        vec![Resource::Agent("agent-a".to_owned())],
+        "the brace holds the lease for the whole pair"
+    );
+    assert_eq!(
+        [
+            declared_resources(&q, node_of(&q, "pause_signal")),
+            declared_resources(&q, node_of(&q, "pause_drain")),
+        ],
+        [vec![], vec![]],
+        "the pause pair borrows the brace's lease and declares nothing itself \
+         — same shape the stop quiesce pair uses"
+    );
+}
+
 #[test]
 fn spawn_shape_provision_create_dropin_reconcile() {
     let q = JobQueue::new(1);