Added the BeyondFacts Lab as a prototype (#1175)

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

@@ -0,0 +1,31 @@
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+public static class BflFieldKindExtensions
+{
+    /// <param name="kind">The kind of field.</param>
+    extension(BflFieldKind kind)
+    {
+        /// <summary>
+        /// Gets the longest value a field of this kind takes, in characters.
+        /// </summary>
+        /// <remarks>
+        /// The values go into the prompts of the chats, so each kind gets a limit that leaves room for the
+        /// rest of a preparation.
+        /// </remarks>
+        public int MaxLength => kind switch
+        {
+            BflFieldKind.SINGLE_LINE => 300,
+            BflFieldKind.MULTI_LINE => 4_000,
+            BflFieldKind.LINK => 2_000,
+            BflFieldKind.CHOICE => 100,
+            BflFieldKind.MULTI_CHOICE => 1_000,
+
+            _ => 0,
+        };
+
+        /// <summary>
+        /// Gets whether a field of this kind offers options to choose from.
+        /// </summary>
+        public bool HasOptions => kind is BflFieldKind.CHOICE or BflFieldKind.MULTI_CHOICE;
+    }
+}