- Rewrite README.md for Deno-based binary distribution
- Update installation instructions for binary downloads
- Document new subcommand CLI structure
- Add troubleshooting, security, and development sections
- Remove Node.js references, add Deno information
- Add comprehensive v4.0.0 changelog entry
- Document all breaking changes
- List new features and technical improvements
- Provide migration guide and command mapping
- Include technical details and benefits
- Create MIGRATION.md guide for v3.x to v4.0 upgrade
- Step-by-step migration instructions
- Configuration compatibility information
- Troubleshooting common migration issues
- Rollback procedures
- Post-migration best practices