CONTRIBUTING.md

# Contributing

## Branches
- `main` — protected, requires passing CI
- Feature branches: `feat/<short-description>`
- Bug fixes: `fix/<short-description>`

## Workflow
1. Fork the repo and create your branch from `main`
2. Run `ruff check app/ tests/` and `bandit -r app/ -q` locally before pushing
3. Run `pytest tests/ --cov=app --cov-fail-under=70` and ensure it passes
4. Open a PR with a clear description of what changed and why

## Commit style
Follow [Conventional Commits](https://www.conventionalcommits.org/):
- `feat:` new feature
- `fix:` bug fix
- `test:` adding or updating tests
- `docs:` documentation only
- `refactor:` no behaviour change
- `ci:` CI/CD changes

## Environment setup
```bash
pip install -r requirements.txt
cp .env.example .env
# Fill in OPENROUTER_API_KEY
```

## Running tests
```bash
pytest tests/ -v --cov=app --cov-report=term-missing
```