Release v0.2.6

feat: optimize tools module imports with lazy loading (v0.2.6)

- Remove direct imports of specific tool implementations from __init__.py
- Implement lazy loading for RAGSearchTool, ComplianceTool, MemorySearchTool
- Add factory functions for tool creation with lazy imports
- Update main.py to use lazy imports for better performance
- Maintain backward compatibility for all existing usage patterns
- Bump version to 0.2.6