Added an introduction and an onboarding chat to the BeyondFacts Lab (#1178)

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

@@ -8,10 +8,10 @@ namespace AIStudio.Assistants.BeyondFactsLab;
 /// </summary>
 /// <remarks>
 /// The provenance store keeps what a chat received by the ID of the chat, and its cleanup at the start removes what
-/// belongs to no chat on the disk. With IDs which follow from the preparation and the step, the cleanup finds the
-/// chats of the lab from the folders alone, without reading a single chat; see ProvenanceCleanup. A chat started
-/// over keeps its ID, so what the old conversation received becomes unreferenced and goes at the next cleanup.
-/// The ID is a version 8 UUID after RFC 9562, built from a SHA-256 hash.
+/// belongs to no chat on the disk. With IDs which follow from the place of a chat, such as the preparation and the
+/// step, the cleanup finds the chats of the lab from the folders alone, without reading a single chat; see
+/// ProvenanceCleanup. A chat started over keeps its ID, so what the old conversation received becomes unreferenced
+/// and goes at the next cleanup. The ID is a version 8 UUID after RFC 9562, built from a SHA-256 hash.
 /// </remarks>
 public static class BflThreadId
 {
@@ -20,17 +20,29 @@ public static class BflThreadId
     /// </summary>
     private const string NAMESPACE = "beyondfacts-lab/thread/";
 
+    /// <summary>
+    /// The ID of the conversation in which the lab tells whether it fits a task.
+    /// </summary>
+    public static readonly Guid ONBOARDING = FromName("onboarding");
+
     /// <summary>
     /// Gets the ID of the chat of a step.
     /// </summary>
     /// <param name="projectId">The ID of the preparation.</param>
     /// <param name="step">The step.</param>
     /// <returns>The ID, the same on every computer and in every run.</returns>
-    public static Guid Of(Guid projectId, BflStep step)
+    public static Guid Of(Guid projectId, BflStep step) => FromName($"{projectId:D}/{step.FolderName}");
+
+    /// <summary>
+    /// Builds the ID of a chat from the name of its place.
+    /// </summary>
+    /// <param name="name">The name of the place, which no other place has.</param>
+    /// <returns>The ID, the same on every computer and in every run.</returns>
+    private static Guid FromName(string name)
     {
-        var name = Encoding.UTF8.GetBytes($"{NAMESPACE}{projectId:D}/{step.FolderName}");
+        var bytesOfName = Encoding.UTF8.GetBytes($"{NAMESPACE}{name}");
         Span<byte> hash = stackalloc byte[SHA256.HashSizeInBytes];
-        SHA256.HashData(name, hash);
+        SHA256.HashData(bytesOfName, hash);
 
         var bytes = hash[..16];
         bytes[6] = (byte)((bytes[6] & 0x0F) | 0x80);