Forgot unversioned xd

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Deck/SingleDeckResponse.cs

@@ -0,0 +1,15 @@
+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Deck;
+
+/// <summary>
+/// Single-deck-update response. Consumed by DeckListUtility.DeckUpdate(user_deck,
+/// format, DeckAttributeType.CustomDeck). Shape is "one UserDeck wrapped under
+/// `user_deck` key" — same for update_name, update_sleeve, update_leader_skin,
+/// update_random_leader_skin.
+/// </summary>
+[MessagePackObject]
+public class SingleDeckResponse
+{
+    [Key("user_deck")] public UserDeck? UserDeck { get; set; }
+}