Update

vendor/github.com/gaissmai/bart/CONTRIBUTING.md

@@ -1 +1,14 @@
-Contributions are welcome, but please open an issue for discussion before sending a pull request.
+## Contributing
+
+Contributions are welcome! Please open an issue first to discuss substantial changes.
+
+### Pull Request Checklist
+- Follow Go formatting and lint rules (golangci-lint passes locally).
+- Run `go test ./...` before sending PRs.
+- Add/adjust tests with good coverage.
+- Update README when behavior or APIs change.
+- Keep commits focused; prefer small, reviewable PRs.
+
+### Governance
+- Be respectful.
+- License your contributions under MIT.