v1.3.0: Serotonin extraction, Go TUI, MD specs generator

Release v1.1.0 - Major feature update

New features:
- Plugin packs: python, rust, terraform, aws, vscode, nvim
- Self-update command with version checking
- Backup/restore functionality
- Enhanced setup wizard with environment detection
- Shell completions for zsh and bash
- GitHub Releases automation
- Chezmoi template tests in CI

Improvements:
- Cross-platform support (macOS, Ubuntu, Arch Linux)
- Docker-based testing infrastructure
- Comprehensive CI pipeline

release(build): v1.0.4