# Contributing

Thank you for improving open tooling for Brazilian construction estimates.

## Before coding

1. Search existing issues and discussions.
2. Open an issue for new formats, formulas, or public API changes.
3. Never upload official datasets, customer data, credentials, or proprietary spreadsheets.

## Development

```bash
npm ci
npm run validate
```

Pull requests must include tests, documentation for user-visible behavior, and a focused commit
history. Contributions are reviewed for substance and technical merit; automated, duplicated, or
metric-only changes are not accepted.

By submitting a contribution, you agree that it is your original work and may be distributed
under the MIT license.