fix(ui): restore agents in sidebar for ops quick access

ui/src/components/LayoutShell.tsx

@@ -118,7 +118,12 @@ function LayoutContent() {
         name: r.routeId,
         exchangeCount: r.exchangeCount,
       })),
-      agents: [],
+      agents: (app.agents || []).map((a: any) => ({
+        id: a.id,
+        name: a.name,
+        status: a.status as 'live' | 'stale' | 'dead',
+        tps: a.tps,
+      })),
     }));
   }, [catalog]);