Added the Model Comparison assistant for blind comparisons of two models (#1009)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Assistants/ModelComparison/ModelComparisonJudgeAnswer.cs

@@ -0,0 +1,21 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// The JSON object the judge is asked to answer with, as it arrives, before it is checked.
+/// </summary>
+/// <remarks>
+/// Both values may be missing or null in what a model writes: ModelComparisonJudgeVerdict.Parse decides
+/// what a usable verdict is, not the reading of the JSON.
+/// </remarks>
+public sealed record ModelComparisonJudgeAnswer
+{
+    /// <summary>
+    /// The column the judge preferred: "A", "B", or "TIE".
+    /// </summary>
+    public string? Preferred { get; set; }
+
+    /// <summary>
+    /// Why the judge decided as it did.
+    /// </summary>
+    public string? Reasoning { get; set; }
+}