v2.0.0: Full 9-Level Navigation System

Major enhancement expanding the system to support all 9 levels:
- Extended from 3-level to complete 9-level navigation support
- Mathematical navigation logic replacing hardcoded case statements
- Added keybindings for levels 4-9 ($%^&*( symbols)
- Visual status bar now displays all 9 levels with proper dots

v1.1.0: Perfect Nested Sessions + Session-Specific Status

Major improvements to session handling and status display:
- True nested session creation with proper hierarchy
- Session-specific status lines showing correct names
- Simplified, more reliable architecture
- Critical bug fixes for session creation and status display