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/ModelComparisonJudgeAgreement.cs

@@ -0,0 +1,27 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// How often a judge chose the same as the user, across the runs which hold both a vote and a verdict of this judge.
+/// </summary>
+public sealed record ModelComparisonJudgeAgreement
+{
+    /// <summary>
+    /// The judge, with the name it had in its latest comparison.
+    /// </summary>
+    public required ModelComparisonModelIdentity Judge { get; init; }
+
+    /// <summary>
+    /// How many runs the judge chose the same as the user: the same model, or a tie both times.
+    /// </summary>
+    public int Agreements { get; init; }
+
+    /// <summary>
+    /// How many runs hold both a vote of the user and a verdict of this judge.
+    /// </summary>
+    public int ComparedRuns { get; init; }
+
+    /// <summary>
+    /// The share of the compared runs in which the judge chose the same as the user, or null without such runs.
+    /// </summary>
+    public double? Share => this.ComparedRuns == 0 ? null : (double)this.Agreements / this.ComparedRuns;
+}