Forgot unversioned xd

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Practice/PracticeStartResponse.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Practice;
+
+[MessagePackObject]
+public class PracticeStartResponse
+{
+    /// <summary>
+    /// Optional mission/achievement evaluation snapshot. Spec: safe to omit entirely;
+    /// client tolerates absence (defensive `Keys.Contains` check). Always null in our
+    /// minimal impl — we don't model missions.
+    /// </summary>
+    [Key("mission_parameter")] public object? MissionParameter { get; set; }
+}