Add testing infrastructure and documentation improvements.
**Task 12: Add pkg-config to Core Dependencies**
- Added pkg-config check at the start of install_system_dependencies()
- Added pkg-config to all distribution package lists
- Provides distro-specific install instructions if pkg-config is missing
- Critical for library detection (GI_TYPELIB_PATH, PortAudio, etc.)
**Task 13: Update README with Distro Info**
- Updated Requirements section with tested distributions
- Added link to DISTRO_COMPATIBILITY.md
- Listed officially supported distros: Ubuntu 22.04+, Debian 11+, Fedora 39+, Arch, openSUSE
- Mentioned experimental support for Gentoo, Alpine, Void, Solus
**Task 14: Create Test Matrix for CI**
- New workflow: .github/workflows/distro-test-matrix.yml
- Tests on multiple container images: Ubuntu 22.04, 24.04, Debian 12, Fedora 39
- Runs dependency checker on each distro
- Tests Python imports and bash syntax validation
- Uses continue-on-error for experimental distro support
**Task 15: Integration Testing Checklist**
- New file: tests/distro-testing-checklist.md
- Comprehensive checklist for testing on new distributions
- Covers: Pre-install, Installation, Post-install, Functionality, Performance, Cleanup
- Includes quick reference commands
- Desktop environment and application-specific testing sections
- Template for submitting test results
Part of cross-distribution compatibility improvements (Phase 4 of 5).
Related to #157
