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;