restore: move RELEASE_v0.2.2.md back to project root

Release File Restoration:
✅ ROOT LEVEL RELEASE: Restored RELEASE_v0.2.2.md to project root directory
- File was previously moved to docs/ directory during reorganization
- Restored from git history (commit a9b2d81d72)
- Maintains original structure with release notes at project root
- README.md correctly references the root-level release file

✅ FILE STRUCTURE: Maintained standard project organization
- Release notes at project root level (standard practice)
- Documentation remains in docs/ directory
- README.md links work correctly with relative path
- No breaking changes to existing references

✅ VERSION CONSISTENCY: v0.2.2 release notes maintained
- Original content preserved from March 24, 2026 release
- Documentation enhancements and repository management focus
- Migration guide and acknowledgments intact
- Links and references working properly

Result: RELEASE_v0.2.2.md successfully restored to project root level with full content preservation and correct README integration.

RELEASE_v0.2.2.md

@@ -0,0 +1,61 @@
+# AITBC v0.2.2 Release Notes
+
+## 🎯 Overview
+AITBC v0.2.2 is a **documentation and repository management release** that focuses on repository transition to sync hub, enhanced documentation structure, and improved project organization for the AI Trusted Blockchain Computing platform.
+
+## 🚀 New Features
+
+### 📚 Documentation Enhancements
+- **Hub Status Documentation**: Complete repository transition documentation
+- **README Updates**: Hub-only warnings and improved project description
+- **Documentation Cleanup**: Removed outdated v0.2.0 release notes
+- **Project Organization**: Enhanced root directory structure
+
+### 🔧 Repository Management
+- **Sync Hub Transition**: Documentation for repository sync hub status
+- **Warning System**: Hub-only warnings in README for clarity
+- **Clean Documentation**: Streamlined documentation structure
+- **Version Management**: Improved version tracking and cleanup
+
+### 📁 Project Structure
+- **Root Organization**: Clean and professional project structure
+- **Documentation Hierarchy**: Better organized documentation files
+- **Maintenance Updates**: Simplified maintenance procedures
+
+## 📊 Statistics
+- **Total Commits**: 350+
+- **Documentation Updates**: 8
+- **Repository Enhancements**: 5
+- **Cleanup Operations**: 3
+
+## 🔗 Changes from v0.2.1
+- Added HUB_STATUS.md documentation
+- Enhanced README with hub-only warnings
+- Removed outdated v0.2.0 release notes
+- Improved project documentation structure
+- Streamlined repository management
+
+## 🚦 Migration Guide
+1. Pull latest updates: `git pull`
+2. Review HUB_STATUS.md for repository information
+3. Check README for updated project information
+4. Verify documentation structure
+
+## 🐛 Bug Fixes
+- Fixed documentation inconsistencies
+- Resolved version tracking issues
+- Improved repository organization
+
+## 🎯 What's Next
+- Enhanced multi-chain support
+- Advanced agent orchestration
+- Performance optimizations
+- Security enhancements
+
+## 🙏 Acknowledgments
+Special thanks to the AITBC community for contributions, testing, and feedback.
+
+---
+*Release Date: March 24, 2026*  
+*License: MIT*  
+*GitHub: https://github.com/oib/AITBC*