feat: surface L2 agent pool and escalations on supervisor screen

- routing-service: GET /escalations (list recent escalation attempts)
- supervisor UI: new panel showing the real agent pool (status, level,
  tenant, skills, calls handled) fed by GET /agents, with a form to add
  operators to the pool
- supervisor UI: new live escalation feed (AI->L2 handoffs, status,
  assigned operator), auto-refreshed every 5s alongside live calls

ui/operator/styles.css

@@ -5987,3 +5987,66 @@ body.analytics-drilldown-open {
     padding: 10px 16px 0;
   }
 }
+
+.agent-pool-item,
+.escalation-item {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 6px 10px;
+  padding: 12px 14px;
+  border: 1px solid var(--line);
+  border-radius: 12px;
+  margin-bottom: 8px;
+  background: #fff;
+}
+
+.agent-pool-item strong,
+.escalation-item strong {
+  flex-basis: 100%;
+}
+
+.status-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 2px 10px;
+  border-radius: 999px;
+  font-size: 12px;
+  font-weight: 700;
+  white-space: nowrap;
+}
+
+.status-badge::before {
+  content: "";
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: currentColor;
+}
+
+.status-badge.is-success {
+  background: var(--success-soft);
+  color: var(--success);
+}
+
+.status-badge.is-warning {
+  background: var(--warning-soft);
+  color: var(--warning);
+}
+
+.status-badge.is-danger {
+  background: var(--danger-soft);
+  color: var(--danger);
+}
+
+.status-badge.is-muted {
+  background: #eef1f6;
+  color: #6b7280;
+}
+
+.agent-pool-meta,
+.escalation-meta {
+  font-size: 12px;
+  color: #6b7280;
+}