chore(settings): disable example-skills plugin

Toggle example-skills@anthropic-agent-skills off — not used in active
profiles, reduces session-start skill enumeration.

Co-Authored-By: Claude <noreply@anthropic.com>

settings.json

@@ -236,7 +236,7 @@
     "command": "bash ~/.claude/hooks/statusline.sh"
   },
   "enabledPlugins": {
-    "example-skills@anthropic-agent-skills": true,
+    "example-skills@anthropic-agent-skills": false,
     "ui-ux-pro-max@ui-ux-pro-max-skill": true,
     "caveman@caveman": true,
     "security-guidance@claude-code-plugins": true,