Set up GitHub Actions workflows for CI testing and automatic versioning

[deleonja]

Goal

Automate testing and version bumping via GitHub Actions using
jungkook as a self-hosted runner.

Workflows to create

1. tests.yml

• Trigger: every push or PR to develop or main
• Runner: self-hosted (jungkook)
• Steps:
  • Checkout repo
  • Run wolframscript -file tests/RunAllTests.wl
  • Block merge if tests fail

2. release.yml

• Trigger: merge to main
• Runner: self-hosted (jungkook)
• Steps:
  • Run tests
  • Bump version in PacletInfo.wl and version.txt
  • Create git tag
  • Create GitHub Release with auto-generated changelog

Prerequisites

• Register jungkook as self-hosted runner in repo settings
• Write tests/RunAllTests.wl and tests/TestUtils.wl
• Enable auto-merge in repo settings
• Set branch protection rules on develop and main