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/ModelComparisonPairing.cs

@@ -0,0 +1,46 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// How two models did directly against each other across all stored comparisons of the two.
+/// </summary>
+/// <remarks>
+/// The first and the second model are those of the pair, see ModelComparisonPairKey, not those of a single comparison:
+/// a comparison in which the user picked them the other way round counts the same.
+/// </remarks>
+public sealed record ModelComparisonPairing
+{
+    /// <summary>
+    /// The first model of the pair, with the name it had in its latest comparison.
+    /// </summary>
+    public required ModelComparisonModelIdentity First { get; init; }
+
+    /// <summary>
+    /// The second model of the pair, with the name it had in its latest comparison.
+    /// </summary>
+    public required ModelComparisonModelIdentity Second { get; init; }
+
+    /// <summary>
+    /// The votes of the user.
+    /// </summary>
+    public ModelComparisonTally Votes { get; init; } = ModelComparisonTally.NONE;
+
+    /// <summary>
+    /// The verdicts of the judges.
+    /// </summary>
+    public ModelComparisonTally JudgeVerdicts { get; init; } = ModelComparisonTally.NONE;
+
+    /// <summary>
+    /// How many comparisons of the two there are.
+    /// </summary>
+    public int ComparisonCount { get; init; }
+
+    /// <summary>
+    /// The share of the decided votes which the first model won, with how sure that share is.
+    /// </summary>
+    public ModelComparisonWinShare WinShareOfFirstByVotes => ModelComparisonWinShare.Of(this.Votes.FirstModelWins, this.Votes.SecondModelWins);
+
+    /// <summary>
+    /// The share of the decided verdicts of the judges which the first model won, with how sure that share is.
+    /// </summary>
+    public ModelComparisonWinShare WinShareOfFirstByJudges => ModelComparisonWinShare.Of(this.JudgeVerdicts.FirstModelWins, this.JudgeVerdicts.SecondModelWins);
+}