chore: add REUSE v3.3 compliance

[synackd]

Pull Request Template

Thank you for your contribution! Please ensure the following before submitting:

Checklist

• My code follows the style guidelines of this project
• I have added/updated comments where needed
• I have added tests that prove my fix is effective or my feature works
• I have run make test (or equivalent) locally and all tests pass
• DCO Sign-off: All commits are signed off (git commit -s) with my real name and email
• REUSE Compliance:
  • Each new/modified source file has SPDX copyright and license headers
  • Any non-commentable files include a <filename>.license sidecar
  • All referenced licenses are present in the LICENSES/ directory

Description

Add REUSE v3.3 compliance to the repo. This includes adding the necessary licenses, SPDX references, and CI checks that check for compliance.

The new MIT license from the Linux Foundation is the current license (2026), while the old Triad license is added for 2024 (when this project was created).

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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For more info, see Contributing Guidelines.

[alexlovelltroy]

I don't think the triad line is required in addition to the OpenCHAMI line in each file based on my previous reading of our code guidelines. If you're sure we need it, we should add it elsewhere and update the copyright year to either 2026 or 2024-2026

[synackd]

I am actually not sure if we need it. I chose to err on the safe side and include it since that was the license before OpenCHAMI joined the LF. I'm happy to get rid of it if it's not required anywhere, just didn't want to get into trouble. 🙂

[alexlovelltroy]

Capturing discussion from meeting:

1. MIT license is the sole license for OpenCHAMI code.
2. Participants may retain copyright over their code with multiple copyright lines at the top of each source file. There is no requirement that all files in the same repository have the same copyright lines.
3. It is my understanding that the Triad contract statement is not required on OpenCHAMI contributions, but including it isn't problematic.

[synackd]

Made the following changes:

1. Got rid of the LICENSES/LicenseRef-Triad.txt license
2. Changed Triad copyright from 2024 to 2024-2025
3. Changed OpenCHAMI copyright from 2026 to 2025 (the year OpenCHAMI joined the HPSF)

Does that work, @alexlovelltroy?