- Rename v3.3 section to 'Advanced Features'
- Add 5 new best practices for v4.0 governance features:
policy definition, drift monitoring, decision logging,
output scoring, and feedback loops
- Reference correct API endpoints for each practice
- FEATURES.md: update version header from v3.3 to v4.0
- BEST-PRACTICES.md: update section header for v3.3+ features
- WORKFLOW-GUIDE.md: update version and prerequisites to v4.0
- WORKFLOW_ENGINE_ARCHITECTURE.md: remove version from title (living doc)
- SOP-multi-agent-orchestration.md: remove version from section header