Added the visual briefing assistant (#893)

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

@@ -0,0 +1,34 @@
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Assistants.VisualBriefing;
+
+/// <summary>
+/// Defines the strict structured response returned by the evidence agent.
+/// </summary>
+[JsonUnmappedMemberHandling(JsonUnmappedMemberHandling.Disallow)]
+public sealed class VisualBriefingEvidenceResponse
+{
+    /// <summary>Gets or sets the evidence contract version.</summary>
+    [JsonRequired]
+    public int ContractVersion { get; set; }
+
+    /// <summary>Gets or sets the extracted factual statements.</summary>
+    [JsonRequired]
+    public List<VisualBriefingEvidenceFact> Facts { get; set; } = [];
+
+    /// <summary>Gets or sets the extracted numeric metrics.</summary>
+    [JsonRequired]
+    public List<VisualBriefingEvidenceMetric> Metrics { get; set; } = [];
+
+    /// <summary>Gets or sets the extracted tables.</summary>
+    [JsonRequired]
+    public List<VisualBriefingEvidenceTable> Tables { get; set; } = [];
+
+    /// <summary>Gets or sets the exactly-once source coverage declarations.</summary>
+    [JsonRequired]
+    public List<VisualBriefingSourceCoverage> SourceCoverage { get; set; } = [];
+
+    /// <summary>Gets or sets the planned use of supplied visual assets.</summary>
+    [JsonRequired]
+    public List<VisualBriefingAssetPlanItem> AssetPlan { get; set; } = [];
+}