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Runtime/Model/SaveEnvelope.cs

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+using System;
+using Newtonsoft.Json.Linq;
+
+namespace Jovian.SaveSystem {
+    /// <summary>
+    /// On-disk wrapper that pairs minimal metadata with the game data payload.
+    /// Payload is stored as JToken so it remains readable JSON when using JsonSaveSerializer.
+    /// </summary>
+    [Serializable]
+    public sealed class SaveEnvelope {
+        public int version;
+        public long timestampUtc;
+        public SaveSlotType slotType;
+        public JToken payload;
+    }
+}

Runtime/Model/SaveEnvelope.cs.meta

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+fileFormatVersion: 2
+guid: ffa4184b4e99e3947ac73fa747d346d7

Runtime/Model/SaveFormat.cs

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+namespace Jovian.SaveSystem {
+    public enum SaveFormat {
+        Json,
+        Binary
+    }
+}

Runtime/Model/SaveFormat.cs.meta

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+fileFormatVersion: 2
+guid: a118c9ab8d89ad546ad67e8dc1a71c98

Runtime/Model/SaveSlotType.cs

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+namespace Jovian.SaveSystem {
+    public enum SaveSlotType {
+        Manual,
+        Auto,
+        Quick
+    }
+}

Runtime/Model/SaveSlotType.cs.meta

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+fileFormatVersion: 2
+guid: 0f1e478bd3e3fec43a55f4efec51577c