broker: resolve <parent> sentinel to topology parent at send time (#692)

hive-c0re/src/manager_server.rs

@@ -113,9 +113,15 @@ async fn dispatch(req: &ManagerRequest, coord: &Arc<Coordinator>) -> ManagerResp
                     }
                 }
             } else {
+                // Resolve magic-recipient sentinels (currently `<parent>`)
+                // against topology.json; no-op for ordinary names. The
+                // manager has no parent in topology, so `<parent>`
+                // resolves to OPERATOR_RECIPIENT — matching mara's
+                // "no parent → tell the operator" rule (#692).
+                let resolved = crate::topology::resolve_recipient(MANAGER_AGENT, to);
                 match coord.broker.send(&Message {
                     from: MANAGER_AGENT.to_owned(),
-                    to: to.clone(),
+                    to: resolved,
                     body: body.clone(),
                     in_reply_to: *in_reply_to,
                 }) {