Added the guided chat to the BeyondFacts Lab (#1177)

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

@@ -0,0 +1,33 @@
+using AIStudio.Models;
+
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+/// <summary>
+/// What a model needs to run the chats of the BeyondFacts Lab.
+/// </summary>
+/// <remarks>
+/// Every chat of the lab keeps its guide in the context, which alone takes about 20,000 tokens. A model with a
+/// smaller context window would lose the beginning of each conversation, or fail right away.
+/// </remarks>
+public static class BflModelRequirements
+{
+    /// <summary>
+    /// The smallest context window the lab accepts, in tokens.
+    /// </summary>
+    /// <remarks>
+    /// The fixed part of the longest system prompt may take about 22,000 tokens, see BflPromptLibraryTests; the
+    /// rest is left for the details of the person and the conversation.
+    /// </remarks>
+    public const int MINIMUM_CONTEXT_TOKENS = 32_000;
+
+    /// <summary>
+    /// Checks whether a model reads enough at once for the lab.
+    /// </summary>
+    /// <remarks>
+    /// A window nobody knows is accepted: many self-hosted models have no statement, and the token budget of the chat
+    /// tells the person when a conversation grows too long.
+    /// </remarks>
+    /// <param name="contextWindow">The context window of the model.</param>
+    /// <returns>True when the window is large enough or unknown.</returns>
+    public static bool HasEnoughContext(ContextWindow contextWindow) => !contextWindow.IsKnown || contextWindow.DefaultTokens >= MINIMUM_CONTEXT_TOKENS;
+}