feat: implement metadata management system v1.2.0

- Add YAML front-matter management with MetadataManager
- Implement bidirectional link resolution system
- Add dependency analysis and auto-publishing
- Create unified CLI with enhanced commands (pub, analyze, config, status)
- Preserve legacy commands for backward compatibility
- Achieve 85.42% test coverage with 196 comprehensive tests
- Add configuration management with project-wide settings

BREAKING CHANGE: Enhanced commands are now primary, original commands moved to *-legacy