Generated the JSON contracts of visual briefings and model answers at compile time (#1151)

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingSourcePrompt.cs

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+namespace AIStudio.Assistants.VisualBriefing;
+
+/// <summary>
+/// A source as the evidence stage shows it its model.
+/// </summary>
+/// <remarks>
+/// The model never sees the internal ID of a source, only its short handle.
+/// </remarks>
+/// <param name="SourceId">The short handle of the source.</param>
+/// <param name="Kind">The kind of the source.</param>
+/// <param name="AssetId">The asset ID of the source, or null when it is no picture of the briefing.</param>
+/// <param name="Name">The file name of the source.</param>
+internal sealed record VisualBriefingSourcePrompt(string SourceId, VisualBriefingSourceKind Kind, string? AssetId, string Name);