Refactor documentation: update active context, progress, project brief, system patterns, tech context to reflect code quality maintenance and testing improvements

memory-bank/systemPatterns.md

@@ -34,8 +34,9 @@
 #### System Layer (Implemented)
 - ✅ **File I/O**: Atomic file operations with backup support
 - ✅ **Permission checking**: Validation of file access permissions
+- ✅ **Permission management**: Sudo request and handling for edit mode
+- ✅ **Backup system**: Automatic backup creation before modifications
 - 🔄 **DNS Resolution**: Planned for Phase 5 advanced features
-- 🔄 **Permission Management**: Sudo handling planned for Phase 3 edit mode
 
 ## Key Technical Decisions
 
@@ -93,10 +94,13 @@ class Config:
 - ✅ **Reactive state**: Using Textual's reactive attributes for complex UI updates
 - ✅ **Configuration state**: Persistent settings with JSON storage and graceful error handling
 - ✅ **Sorting state**: Reactive sort column and direction with visual indicators
+- ✅ **Edit mode state**: Safe transitions between read-only and edit modes
+- ✅ **Permission state**: Sudo request, validation, and release management
 - ✅ **Validation pipeline**: All data validated in models, parser, and configuration
 - ✅ **File integrity**: Atomic operations preserve file structure
 - ✅ **Error handling**: Graceful degradation for all error conditions
 - ✅ **Modal state**: Professional modal dialog lifecycle management
+- ✅ **Change detection**: Intelligent tracking for save confirmation
 - 🔄 **Undo/Redo capability**: Planned for Phase 4 with command pattern
 - 🔄 **Dirty state tracking**: Will be implemented in Phase 3 edit mode