finish secrets finding work and audit remarks work save

src/Scanner/__Libraries/StellaOps.Scanner.Sources/Handlers/ISourceTypeHandler.cs

@@ -106,7 +106,7 @@ public sealed record WebhookPayloadInfo
     public string? Actor { get; init; }
 
     /// <summary>Timestamp of the event.</summary>
-    public DateTimeOffset Timestamp { get; init; } = DateTimeOffset.UtcNow;
+    public required DateTimeOffset Timestamp { get; init; }
 
     /// <summary>Additional metadata from the payload.</summary>
     public Dictionary<string, string> Metadata { get; init; } = [];