docs: rewrite README from scratch

- Remove duplicate 'Recent Additions' sections
- Fix test count: 161 → 173
- Add Human-in-the-Loop section
- Add Governance section
- Reorder: Quick Start → Plugin → MCP → Trace → Memory → Human → Governance → Architecture → ETCLOVG → Testing
- Clean up code examples
- Remove all skill-factory references
- 396 → 396 lines, much cleaner structure

Author: 523034406