refactoring

security update

lib/features/core/utils/mutex.dart

@@ -20,6 +20,7 @@ class Mutex {
     return value;
   }
 
+  /// Allows listening to the completion status of the last worker process to be released.
   Future<void> get lastOperationCompletionAwaiter =>
       _completerQueue.isNotEmpty ? _completerQueue.last.future : Future.value();
 }