Kernova tooling 0.1.8-beta

Summary

• Split publish packaging and changelog handling by platform so Modrinth and CurseForge can use platform-specific release notes and artifacts.
• Added platform selection for packaging and PackPing sync paths.
• Improved upload/release flow so a successful platform can continue when the other platform fails during a combined release.
• Updated publish tests for the new partial-success release behavior.

Validation

• updater/.venv/bin/python -m unittest discover -s updater/tests
• updater/.venv/bin/kernova-update validate --artifacts
• python3 publish/publish.py upload --latest --loader both --mc 26.1.2 --platform both --dry-run

Publishing

• Modrinth and CurseForge modpack uploads were not performed.
• PackPing feed sync/push was not performed.
• No remaining manual work is known.