Added the BeyondFacts Lab as a prototype (#1175)

app/MindWork AI Studio/Assistants/BeyondFactsLab/BflMissingDetails.cs

@@ -0,0 +1,27 @@
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+/// <summary>
+/// Finds the key details a preparation of the BeyondFacts Lab still lacks.
+/// </summary>
+/// <remarks>
+/// Missing details never block anything: the person may continue, and the chat asks for them.
+/// </remarks>
+public static class BflMissingDetails
+{
+    /// <summary>
+    /// Gets the key details of a step which its form leaves empty.
+    /// </summary>
+    /// <param name="step">The step.</param>
+    /// <param name="form">The form of the step.</param>
+    /// <returns>The fields which are missing, in the order the form shows them.</returns>
+    public static IReadOnlyList<BflFieldDefinition> Of(BflStep step, BflStepFormData form) =>
+        [.. BflFieldCatalog.ForStep(step).Where(field => field.IsKeyDetail && string.IsNullOrWhiteSpace(form.Get(field.Id)))];
+
+    /// <summary>
+    /// Gets the steps whose forms leave key details empty.
+    /// </summary>
+    /// <param name="forms">The forms of a preparation, by their steps; a step without a form counts as empty.</param>
+    /// <returns>The steps with missing details, in their order.</returns>
+    public static IReadOnlyList<BflStep> StepsOf(IReadOnlyDictionary<BflStep, BflStepFormData> forms) =>
+        [.. BflStep.All.Where(step => Of(step, forms.GetValueOrDefault(step) ?? new BflStepFormData()).Count > 0)];
+}