Comments and documentation update

src/autoloads/SaveManager.gd

@@ -1,3 +1,9 @@
+## Save Manager - Secure Game Data Persistence System
+##
+## Provides secure save/load functionality with tamper detection, race condition protection,
+## and permissive validation. Features backup/restore, version migration, and data integrity.
+## Implements multi-layered security: checksums, size limits, type validation, and bounds checking.
+
 extends Node
 
 const SAVE_FILE_PATH: String = "user://savegame.save"
@@ -8,7 +14,7 @@ const MAX_SCORE: int = 999999999
 const MAX_GAMES_PLAYED: int = 100000
 const MAX_FILE_SIZE: int = 1048576  # 1MB limit
 
-# Save operation protection
+# Save operation protection - prevents race conditions
 var _save_in_progress: bool = false
 var _restore_in_progress: bool = false
 
@@ -28,10 +34,12 @@ var game_data: Dictionary = {
 
 
 func _ready() -> void:
+	"""Initialize SaveManager and load existing save data on startup"""
 	load_game()
 
 
 func save_game() -> bool:
+	"""Save current game data with race condition protection and error handling"""
 	# Prevent concurrent saves
 	if _save_in_progress:
 		DebugManager.log_warn("Save already in progress, skipping", "SaveManager")
@@ -82,6 +90,7 @@ func _perform_save() -> bool:
 
 
 func load_game() -> void:
+	"""Load game data from disk with comprehensive validation and error recovery"""
 	if not FileAccess.file_exists(SAVE_FILE_PATH):
 		DebugManager.log_info("No save file found, using defaults", "SaveManager")
 		return