DO NOT MERGE Add script to compare MIxS schema releases using GitHub API

[turbomam]

• Created diff_two_linkml_mixs_releases.py script to fetch release information
• Script lists all GitHub releases with commit hashes and YAML files
• Finds mixs.yaml files in approved directories (src/, model/)
• Supports GitHub API authentication via local/.env file
• Added python-dotenv and requests dependencies to pyproject.toml
• Created local/.env.template for GitHub token setup

🤖 Generated with Claude Code

[github-actions[bot]]

PR Preview Action v1.6.2 :---: |

:rocket: View preview at
https://GenomicsStandardsConsortium.github.io/mixs/pr-preview/pr-1026/

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Built to branch gh-pages at 2025-07-21 16:44 UTC.
Preview will be ready when the GitHub Pages deployment is complete.

[jfy133]

Note I would suggest putting in draft mode rather than 'DO NOT MERGE' in the title ;)