First go around with save load system

Assets/Scripts/Data/CardSystem/CardSystemManager.cs

@@ -461,6 +461,13 @@ namespace Data.CardSystem
 
         #region ISaveParticipant Implementation
 
+        private bool hasBeenRestored;
+
+        /// <summary>
+        /// Returns true if this participant has already had its state restored.
+        /// </summary>
+        public bool HasBeenRestored => hasBeenRestored;
+
         /// <summary>
         /// Returns the unique save ID for the CardSystemManager.
         /// Since this is a singleton global system, the ID is constant.
@@ -487,6 +494,7 @@ namespace Data.CardSystem
             if (string.IsNullOrEmpty(serializedData))
             {
                 Logging.Debug("[CardSystemManager] No saved state to restore, using defaults");
+                hasBeenRestored = true;
                 return;
             }
 
@@ -496,6 +504,7 @@ namespace Data.CardSystem
                 if (state != null)
                 {
                     ApplyCardCollectionState(state);
+                    hasBeenRestored = true;
                     Logging.Debug("[CardSystemManager] Successfully restored card collection state");
                 }
                 else