docs: dual license, CLA, and contributing guide

CLA.md

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+# Contributor License Agreement
+
+Thank you for your interest in contributing to Score.
+
+By submitting a pull request, issue, or any other contribution to this
+repository, you agree to the following terms:
+
+## 1. Grant of Copyright License
+
+You grant Bree Yard a perpetual, worldwide, non-exclusive, royalty-free,
+irrevocable copyright license to reproduce, prepare derivative works of,
+publicly display, publicly perform, sublicense, and distribute your
+contributions and derivative works thereof, under any license — including
+commercial licenses.
+
+## 2. Grant of Patent License
+
+If your contribution includes any patented material, you grant Bree Yard a
+perpetual, worldwide, non-exclusive, royalty-free, irrevocable patent license
+to make, use, sell, offer for sale, import, and otherwise transfer the
+contribution.
+
+## 3. Original Work
+
+You represent that each of your contributions is your original creation and
+that you have the legal right to grant the above licenses. If your employer
+has rights to intellectual property you create, you represent that you have
+received permission to make the contribution on behalf of that employer.
+
+## 4. No Obligation
+
+You understand that the decision to include your contribution in the project
+rests entirely with the project maintainer and that this agreement does not
+obligate the maintainer to include your contribution.
+
+## 5. Acknowledgement
+
+By opening a pull request against this repository, you acknowledge that you
+have read, understood, and agree to be bound by the terms of this Contributor
+License Agreement.
+
+---
+
+*This CLA is based on the Apache Individual Contributor License Agreement v2.0
+and adapted for this project.*

CONTRIBUTING.md

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+# Contributing to Score
+
+Thank you for contributing to Score.
+
+## Contributor License Agreement
+
+**All contributors must agree to the [Contributor License Agreement](CLA.md)
+before their pull request can be merged.**
+
+By opening a pull request, you automatically agree to the CLA terms. No
+separate signature is required — your PR submission is your agreement.
+
+## Code Standards
+
+All contributions must follow the project thesis:
+
+- Zero `let` — `const` everywhere
+- Zero `class` — factory functions only
+- Pure functions by default
+- Append-only state — new versions, not mutations
+- IO and hardware boundaries annotated explicitly with `// BOUNDARY — [reason]`
+
+Contributions that do not follow these standards will receive a change request.
+
+## Pull Request Process
+
+1. Fork the repository and create your branch from `dev`
+2. Write tests for any new functionality
+3. Ensure all existing tests pass (`pnpm test`)
+4. Add TSDoc comments to all public exports
+5. Open your PR against `dev` (not `main`)
+6. A maintainer will review and merge
+
+## Reporting Issues
+
+Open an issue on GitHub. For security issues, email bree@breeyard.com directly.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the
+same terms as the project. See [LICENSE](LICENSE) and [CLA.md](CLA.md).

LICENSE

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+Copyright (c) 2024–present Bree Yard. All rights reserved.
+
+────────────────────────────────────────────────────────────────────────────
+NON-COMMERCIAL LICENSE (MIT)
+────────────────────────────────────────────────────────────────────────────
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to use,
+copy, modify, merge, publish, distribute, and/or sublicense the Software
+solely for non-commercial purposes, subject to the following conditions:
+
+  1. The above copyright notice and this permission notice shall be included
+     in all copies or substantial portions of the Software.
+
+  2. "Non-commercial" means personal, educational, research, open-source,
+     or artistic use. This explicitly includes artists, musicians, and
+     producers who use the Software to create, perform, distribute, or
+     commercially release music or other creative works — the music you
+     make with Score is yours, and you may profit from it freely.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+────────────────────────────────────────────────────────────────────────────
+COMMERCIAL LICENSE
+────────────────────────────────────────────────────────────────────────────
+
+Commercial use of the Software *as software* — meaning embedding, bundling,
+or distributing Score as part of a revenue-generating software product or
+service (including but not limited to DAW plugins, SaaS platforms, streaming
+infrastructure, or tools sold to end users) — requires a separate commercial
+license.
+
+Using Score to create, produce, perform, or release music does not require a
+commercial license, regardless of whether that music generates revenue.
+
+To request a commercial license, contact: bree@breeyard.com
+
+Unauthorised commercial use is a violation of copyright law.