fix(panel): phantom agent states in dashboard + metrics counters

by_state.running / a.state 'running'/'stopped' never exist in the
orchestrator enum (offline/starting/active/waiting/idle/stopping), so
these counters were structurally zero — same class as the agents-page
Active bug, remaining two sites.

panel/src/app/(dashboard)/metrics/page.tsx

@@ -250,11 +250,11 @@ function PerformanceTabContent() {
 
   // Agent counts
   const runningAgents =
-    status?.by_state?.running ||
-    agentList.filter((a) => a.state === "running").length;
+    status?.by_state?.active ||
+    agentList.filter((a) => a.state === "active").length;
   const idleAgents =
     status?.by_state?.idle ||
-    agentList.filter((a) => a.state === "idle" || a.state === "stopped").length;
+    agentList.filter((a) => a.state === "idle" || a.state === "offline").length;
   const waitingAgents =
     status?.waiting_count ||
     agentList.filter((a) => a.state === "waiting_long").length;

panel/src/hooks/use-dashboard.ts

@@ -80,7 +80,7 @@ export function useMetrics() {
         blockers,
         agents: {
           total_agents: agentStatus?.total_agents ?? 0,
-          running: agentStatus?.by_state?.running ?? 0,
+          running: agentStatus?.by_state?.active ?? 0,
           idle: agentStatus?.by_state?.idle ?? 0,
           waiting: agentStatus?.waiting_count ?? 0,
           errors: 0,