- Add test_parser.cpp with argument parsing tests
- Add test_validator.cpp with configuration validation tests
- Add test_converter.cpp with FFmpeg command building tests
- Update Makefile with test targets for unit tests
- Update CI workflow to run make test
- Add test binaries and media files to .gitignore
- Add .devcontainer/devcontainer.json for Podman development
- Add shell.nix for Nix users
- Refactor monolithic main.cpp into modular components:
- parser: argument parsing
- validator: configuration validation
- converter: ffmpeg command building/execution
- Update Makefile with proper dependencies and test target
- Simplify build.sh to use make
- Update README with development environment docs
