chore: License Transition — GPL 3.0 → PolyForm Noncommercial 1.0.0

CONTRIBUTING.md

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+# Contributing to NextUI
+
+Thanks for your interest in contributing. This document covers the basics of how to get involved.
+
+## Ways to Contribute
+
+- **Bug reports** — open an issue describing the problem, steps to reproduce, and your device/firmware version
+- **Feature requests** — open an issue before writing any code, so we can discuss whether it's a good fit
+- **Pull requests** — for bug fixes and agreed-upon features; please link the related issue in your PR description
+
+## Opening Issues
+
+Before opening an issue, search existing ones to avoid duplicates. When reporting a bug, include:
+
+- What you expected to happen
+- What actually happened
+- Steps to reproduce
+- Device and firmware version
+
+## Submitting Pull Requests
+
+1. Fork the repository and create a branch from `main`
+2. Keep changes focused — one fix or feature per PR
+3. Test your changes on hardware before submitting
+4. Write a clear PR description explaining what and why, not just what
+
+PRs that introduce large or unilateral changes without prior discussion may be closed. When in doubt, open an issue first.
+
+## License
+
+By contributing to NextUI, you agree that your contributions will be licensed under
+[PolyForm Noncommercial 1.0.0](https://polyformproject.org/licenses/noncommercial/1.0.0).
+You retain copyright over your own contributions.
+
+If you are contributing on behalf of a company or organization, you confirm that you
+are authorized to make that contribution under these terms.
+
+This project does not use a formal CLA. By opening a pull request, you are agreeing
+to the above and confirming that you have the right to do so.
+
+## Upstream
+
+NextUI is a fork of [MinUI](https://github.com/shauninman/MinUI) by Shaun Inman.
+Contributions should be mindful of that heritage. See [NOTICE](NOTICE) for details.