- Implement two-phase rollback system inspired by apt-tx project
- Add package state tracking (newly_installed, upgraded, previously_installed)
- Enhance both core and advanced transaction APIs with rollback methods
- Add comprehensive rollback documentation in docs/rollback.md
- Create rollback_demo.rs example demonstrating functionality
- Update README with detailed crate usage instructions
- Add rollback features to feature flags documentation
- Fix import issues in advanced crate modules
- Add get_installed_packages method to AptCommands
- Include both crates.io and git installation options in README
