stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.AuditPack/Services/DsseExportEnvelope.cs

@@ -0,0 +1,11 @@
+namespace StellaOps.AuditPack.Services;
+
+/// <summary>
+/// DSSE envelope for export.
+/// </summary>
+public sealed record DsseExportEnvelope
+{
+    public required string PayloadType { get; init; }
+    public required string Payload { get; init; }
+    public required IReadOnlyList<DsseSignature> Signatures { get; init; }
+}