feat: add inspect column to agent instance data table

Add a dedicated inspect button column (↗) to navigate to the agent
instance page, consistent with the exchange inspect pattern on the
Dashboard. Row click still opens the detail slide-in panel.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentHealth/AgentHealth.module.css

@@ -98,6 +98,24 @@
   color: var(--text-primary);
 }
 
+.inspectLink {
+  background: transparent;
+  border: none;
+  color: var(--text-faint);
+  opacity: 0.75;
+  cursor: pointer;
+  font-size: 13px;
+  padding: 2px 4px;
+  border-radius: var(--radius-sm);
+  line-height: 1;
+  display: inline-flex;
+}
+
+.inspectLink:hover {
+  color: var(--text-primary);
+  opacity: 1;
+}
+
 .instanceMeta {
   color: var(--text-muted);
   white-space: nowrap;

ui/src/pages/AgentHealth/AgentHealth.tsx

@@ -1,5 +1,5 @@
 import { useState, useMemo } from 'react';
-import { useParams } from 'react-router';
+import { useParams, useNavigate } from 'react-router';
 import {
   StatCard, StatusDot, Badge, MonoText, ProgressBar,
   GroupCard, DataTable, LineChart, EventFeed, DetailPanel,
@@ -240,6 +240,7 @@ function mapLogLevel(level: string): LogEntry['level'] {
 
 export default function AgentHealth() {
   const { appId } = useParams();
+  const navigate = useNavigate();
   const { data: agents } = useAgents(undefined, appId);
   const [eventSortAsc, setEventSortAsc] = useState(false);
   const [eventRefreshTo, setEventRefreshTo] = useState<string | undefined>();
@@ -307,6 +308,23 @@ export default function AgentHealth() {
         width: '12px',
         render: (_val, row) => <StatusDot variant={normalizeStatus(row.status)} />,
       },
+      {
+        key: '_inspect',
+        header: '',
+        width: '36px',
+        render: (_val, row) => (
+          <button
+            className={styles.inspectLink}
+            title="Open instance page"
+            onClick={(e) => {
+              e.stopPropagation();
+              navigate(`/agents/${row.application}/${row.id}`);
+            }}
+          >
+            &#x2197;
+          </button>
+        ),
+      },
       {
         key: 'name',
         header: 'Instance',