docs: consolidate CLI documentation and purge legacy structure

MERGE OPERATIONS:
- Merged /opt/aitbc/cli/docs into /opt/aitbc/docs/cli
- Eliminated duplicate CLI documentation locations
- Created single source of truth for CLI docs

ORGANIZATION IMPROVEMENTS:
- Created structured subdirectories:
  • implementation/ - Core implementation summaries
  • analysis/ - Analysis reports and integration summaries
  • guides/ - Installation and setup guides
  • legacy/ - Historical documentation (archived)

- Updated main README.md with:
  • New consolidated structure overview
  • Updated installation instructions for flat CLI structure
  • Recent CLI design principles changes
  • Proper navigation to subdirectories

- Created legacy/README.md with:
  • Clear deprecation notice
  • File categorization
  • Purge candidates identification
  • Migration notes from old to new structure

FILE MOVES:
- 15 implementation summaries → implementation/
- 5 analysis reports → analysis/
- 3 setup guides → guides/
- 19 legacy documented files → legacy/
- 1 demonstration file → root (active reference)

PROJECT DOCUMENTATION UPDATES:
- Updated /docs/beginner/02_project/1_files.md
- Reflected flattened CLI structure (cli/commands/ vs cli/aitbc_cli/commands/)
- Added docs/cli/ as consolidated documentation location
- Updated Python version requirement to 3.13.5 only

BENEFITS:
- Single location for all CLI documentation
- Clear separation of current vs legacy information
- Better organization and discoverability
- Easier maintenance and updates
- Proper archival of historical documentation

STATUS:
✅ Consolidation complete
✅ Legacy properly archived
✅ Structure organized
✅ Documentation updated

docs/cli/legacy/documented_Blockchain_Balance_Multi-Chain_Enhancement.md

@@ -0,0 +1,51 @@
+# Blockchain Balance Multi-Chain Enhancement
+
+## Overview
+This document provides comprehensive technical documentation for blockchain balance multi-chain enhancement.
+
+**Original Source**: cli/BLOCKCHAIN_BALANCE_MULTICHAIN_ENHANCEMENT.md
+**Conversion Date**: 2026-03-08
+**Category**: cli
+
+## Technical Implementation
+
+### 🔧 **Technical Implementation**
+
+
+
+
+### **✅ Technical Benefits**
+
+- **Scalable Design**: Easy to add new chains to the registry
+- **Consistent API**: Matches multi-chain patterns in wallet commands
+- **Performance**: Parallel chain queries for faster responses
+- **Maintainability**: Clean separation of single vs multi-chain logic
+
+---
+
+
+
+### 🧪 **Testing Implementation**
+
+
+
+
+### **Chain Registry Integration**
+
+**Current Implementation**: Hardcoded chain list `['ait-devnet', 'ait-testnet']`  
+**Future Enhancement**: Integration with dynamic chain registry
+
+```python
+
+
+
+## Status
+- **Implementation**: ✅ Complete
+- **Documentation**: ✅ Generated
+- **Verification**: ✅ Ready
+
+## Reference
+This documentation was automatically generated from completed analysis files.
+
+---
+*Generated from completed planning analysis*