copy from github

Runtime/ISaveSystem.cs

@@ -0,0 +1,24 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Jovian.SaveSystem {
+    /// <summary>
+    /// Top-level facade for the save system. Orchestrates serialization,
+    /// storage, and slot management. This is the main API the game interacts with.
+    /// </summary>
+    public interface ISaveSystem {
+        string CreateSession();
+        bool HasAnySaves();
+
+        void Save<TData>(string sessionId, TData data, SaveSlotType slotType);
+        TData Load<TData>(SaveSlotInfo slot);
+
+        Task SaveAsync<TData>(string sessionId, TData data, SaveSlotType slotType);
+        Task<TData> LoadAsync<TData>(SaveSlotInfo slot);
+
+        IReadOnlyList<SaveSlotInfo> GetSlots(string sessionId);
+        IReadOnlyList<SaveSessionInfo> GetAllSessions();
+        void DeleteSlot(SaveSlotInfo slot);
+        void DeleteSession(string sessionId);
+    }
+}