chore(config): enable lint plugin in settings

Adds lint@holocron to enabledPlugins so Vale-based prose linting
skills are available in this repo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0186ERbyACLRuRxPRnqwpa4m

.claude/settings.json

@@ -4,7 +4,8 @@
     "core@holocron": true,
     "git@holocron": true,
     "gitea@holocron": true,
-    "kyberforge@holocron": true
+    "kyberforge@holocron": true,
+    "lint@holocron": true
   },
   "hooks": {
     "PreToolUse": []