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

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

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+using System.Text.Json;
+
+namespace AIStudio.Assistants.VisualBriefing;
+
+/// <summary>
+/// The interactions in the data of a briefing: its controls, their state, and the formulas which depend on them.
+/// </summary>
+/// <param name="Controls">The validated interaction controls.</param>
+/// <param name="State">The initial value of each control, by its ID.</param>
+/// <param name="Formulas">The formula of each result slot, by the ID of the slot.</param>
+internal sealed record VisualBriefingInteractionData(
+    IReadOnlyList<VisualBriefingControlSpec> Controls,
+    Dictionary<string, JsonElement> State,
+    Dictionary<string, VisualBriefingFormulaNode> Formulas);