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/ModelComparisonRunResult.cs

@@ -0,0 +1,42 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// What a comparison run brought back: the answers of the two models.
+/// </summary>
+public sealed record ModelComparisonRunResult
+{
+    /// <summary>
+    /// When the run ended. Both answers are shown with this one time: a time of their own would
+    /// tell the faster model from the slower one.
+    /// </summary>
+    public DateTimeOffset Time { get; init; } = DateTimeOffset.Now;
+
+    public required ModelComparisonAnswer First { get; init; }
+
+    public required ModelComparisonAnswer Second { get; init; }
+
+    /// <summary>
+    /// What an optional judge said about the two answers, or null when no judge was asked, or when
+    /// there was nothing for it to judge because at least one model did not answer.
+    /// </summary>
+    public ModelComparisonJudgeVerdict? Judge { get; init; }
+
+    /// <summary>
+    /// Whether both models answered. Only then there is anything to vote on: a vote between an
+    /// answer and a failure would say nothing about the models.
+    /// </summary>
+    public bool BothCompleted => this.First.Completed && this.Second.Completed;
+
+    /// <summary>
+    /// Gets the answer of a model of the run.
+    /// </summary>
+    /// <param name="model">The first or the second model; a tie names no model.</param>
+    /// <returns>The answer of that model.</returns>
+    public ModelComparisonAnswer AnswerOf(ModelComparisonModelChoice model) => model switch
+    {
+        ModelComparisonModelChoice.FIRST => this.First,
+        ModelComparisonModelChoice.SECOND => this.Second,
+
+        _ => throw new ArgumentOutOfRangeException(nameof(model), model, $"The choice '{model}' names no model."),
+    };
+}