Fix build and code structure improvements. New but essential UI functionality. CI improvements. Documentation improvements. AI module improvements.

src/Scanner/StellaOps.Scanner.WebService/Services/AttestationChainVerifier.cs

@@ -206,8 +206,6 @@ public sealed class AttestationChainVerifier : IAttestationChainVerifier
         string findingId,
         CancellationToken cancellationToken = default)
     {
-        ArgumentNullException.ThrowIfNull(scanId);
-        
         if (string.IsNullOrWhiteSpace(findingId))
         {
             return null;