[Bug] Race condition with git index.lock during lint-staged pre-commit failures

Bug Description
Summary of the problem: When lint-staged fails during a pre-commit hook, it takes a moment to clean up its index.lock. Claude Code sees the failure, immediately retries (sometimes bypassing hooks), and hits the lock file in that brief cleanup window. By the time it tries to rm the lock, it's already gone.

Environment Info

• Platform: darwin
• Terminal: zed (happened in VS Code's integrated terminal too)
• Version: 2.1.58
• Feedback ID: 2cfba95b-ba0c-4fbe-9238-f46175171407