## Summary
- Lazy-import `create_app`/`run_server` in `headroom/proxy/__init__.py`
via PEP 562 `__getattr__` to prevent CLI crash when `fastapi` is not
installed (i.e., installed without `[proxy]` extras)
- Fix `.pre-commit-config.yaml` to use `python3` instead of `python`
(unavailable on macOS Homebrew)
- Add graceful `ImportError` skip in `scripts/sync-plugin-versions.py`
for environments without dev dependencies
Fixes#441
## Test plan
- [x] `headroom --help` works without `[proxy]` extras installed
- [x] `headroom proxy --help` works with `[proxy]` extras installed
- [x] `headroom proxy --port 18787` starts and serves traffic
- [x] Lazy imports resolve correctly: `from headroom.proxy import
create_app, run_server`
- [x] `AttributeError` raised for invalid attributes on `headroom.proxy`
- [x] Pre-commit hooks pass (ruff, ruff-format, mypy,
sync-plugin-versions)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Code Bot <claude-code@smartwatermelon.github>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
