**Problem:**
Vercel deployments were failing during `pnpm install` because the `prepare` script tried to run `lefthook install`, which requires a git repository. Vercel's build environment doesn't have a proper `.git` directory, causing:
```
fatal: not a git repository (or any parent up to mount point /vercel)
Error: exit status 128
```
**Solution:**
Skip Lefthook installation when running in CI or Vercel environments by checking `process.env.CI` and `process.env.VERCEL` before attempting to install git hooks.
**Impact:**
- Vercel deployments will now succeed
- Local development still gets git hooks installed
- GitHub Actions CI will skip hook installation (not needed in CI)
- All previous tool execution fixes can now actually deploy
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
