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

hive-c0re/src/socket_server/lifecycle_handlers.rs

@@ -129,9 +129,15 @@ pub(super) async fn handle_kill(coord: &Arc<Coordinator>, agent: &str, name: &st
     .await;
     match result {
         Ok(()) => {
-            coord.notify_manager(&hive_sh4re::HelperEvent::Killed {
-                agent: name.to_owned(),
-            });
+            coord
+                .push_todo(
+                    hive_sh4re::MANAGER_AGENT,
+                    "core",
+                    Some(format!("killed:{name}")),
+                    format!("agent '{name}' killed"),
+                    None,
+                )
+                .await;
             Response::Ok
         }
         Err(e) => Response::Err {