Added a way to read what the AI received from your sources (#1100)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/RAG/AugmentationResult.cs

@@ -0,0 +1,15 @@
+using AIStudio.Chat;
+
+namespace AIStudio.Tools.RAG;
+
+/// <summary>
+/// What an augmentation process did: the chat thread it augmented, and what it handed to the AI.
+/// </summary>
+/// <remarks>
+/// The contexts the AI received can be fewer than the ones retrieved, e.g., when a check of which
+/// passages fit the question left some out. Whoever lists the sources and passages of the answer
+/// takes them from here, so the user sees what the AI read and nothing else.
+/// </remarks>
+/// <param name="ChatThread">The augmented chat thread.</param>
+/// <param name="UsedContexts">The retrieval contexts handed to the AI, in the order it received them.</param>
+public sealed record AugmentationResult(ChatThread ChatThread, IReadOnlyList<PreparedRetrievalContext> UsedContexts);