feature/saves-and-score (#8)

Reviewed-on: #8
Co-authored-by: Vladimir nett00n Budylnikov <git@nett00n.org>
Co-committed-by: Vladimir nett00n Budylnikov <git@nett00n.org>

docs/MAP.md

@@ -60,6 +60,16 @@ Located in `src/autoloads/`, these scripts are automatically loaded when the gam
    - Timestamp-based log formatting with category support
    - Runtime log level filtering for development and production builds
 
+6. **SaveManager** (`src/autoloads/SaveManager.gd`)
+   - Persistent game data management with comprehensive validation
+   - High score tracking and current score management
+   - Game statistics (games played, total score)
+   - Grid state persistence for match-3 gameplay continuity
+   - Progress reset functionality with complete data cleanup
+   - Security features: backup system, checksum validation, file size limits
+   - Robust error handling with backup restoration capabilities
+   - Uses: `user://savegame.save` for persistent storage
+
 ## Scene Hierarchy & Flow
 
 ### Main Scenes