feat: enable lefthook only in Claude Code environment (#56)

* feat: enable lefthook only in Claude Code environment

- Add skip condition using CLAUDECODE environment variable
- Hooks will only run when CLAUDECODE=1 (Claude Code environment)
- Manual development remains unaffected by git hooks

* docs: use English comment for consistency in lefthook config

Author: nyatinte

lefthook.yml

@@ -2,6 +2,8 @@
 # https://github.com/evilmartians/lefthook
 
 pre-commit:
+  skip:
+    - run: test "$CLAUDECODE" != 1  # Skip for non-Claude Code environments
   commands:
     ci:
       run: bun run ci