ci: publish Python distributions to GitHub releases

[JerrettDavis]

Summary

• make the release job explicitly publish Python wheels and sdists to the GitHub Release
• split GitHub Release asset uploads so Python distributions and Node tarballs are visible as separate publish paths
• document that Python uses GitHub Release assets because GitHub Packages has no PyPI-compatible registry
• add workflow regression coverage for the Python-to-GitHub upload step

Tests

• python -m pytest tests\test_release_workflows.py
• actionlint .github\workflows\release.yml
• act workflow_dispatch -W .github/workflows/release.yml -e .github/act/dry-run.json -n

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!