chore: update .gitignore

Author: yoshinorin

.gitignore

@@ -42,10 +42,11 @@ analyze/
 config.js
 config.local.js
 
-# Copilot
+# AI
 .github/copilot-instructions.md
 .github/copilot/*.md
 .github/copilot/**/*.md
+.claude
 
 # images
 # can i use case-insensitive?