hive-c0re: push Destroyed as a todo, not a broker message

hive-c0re/src/actions.rs

@@ -963,9 +963,15 @@ pub async fn destroy(coord: &Arc<Coordinator>, name: &str, purge: bool) -> Resul
         tracing::warn!(%name, error = ?e, "agent_power: remove on destroy failed");
     }
     drop(guard);
-    coord.notify_manager(&HelperEvent::Destroyed {
-        agent: name.to_owned(),
-    });
+    coord
+        .push_todo(
+            hive_sh4re::MANAGER_AGENT,
+            "core",
+            Some(format!("destroyed:{name}")),
+            format!("agent '{name}' destroyed"),
+            None,
+        )
+        .await;
     // Container row disappeared — rescan so the dashboard fires
     // `ContainerRemoved` for the gone row, then emit the
     // tombstones snapshot (gained one on destroy, lost one on