Forgot unversioned xd

SVSim.EmulatedEntrypoint/Models/Dtos/Common/EmptyResponse.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+
+/// <summary>
+/// Shared empty response. Used for endpoints whose spec mock is `"data": {}`
+/// (set_deck_redis, update_order, delete_deck_list, etc.). Includes a sentinel
+/// nullable field so MessagePack-CSharp emits a string-keyed empty map cleanly.
+/// </summary>
+[MessagePackObject]
+public class EmptyResponse
+{
+    [Key("_")] public object? Reserved { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Common/Reward.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+
+/// <summary>
+/// Stub for the Reward shape (spec: common/types.ts.md#reward). Fleshed out when actual
+/// reward-granting flows land. Today's endpoints all emit empty reward_list arrays.
+/// </summary>
+[MessagePackObject]
+public class Reward
+{
+    [Key("type")] public int? Type { get; set; }
+    [Key("value")] public long? Value { get; set; }
+    [Key("num")] public int? Num { get; set; }
+}