Improve XML documentation coverage across src modules and sync generated analysis artifacts.

src/NATS.Server/Auth/IAuthenticator.cs

@@ -6,13 +6,28 @@ namespace NATS.Server.Auth;
 
 public interface IAuthenticator
 {
+    /// <summary>
+    /// Attempts to authenticate a client connection.
+    /// </summary>
+    /// <param name="context">Authentication context containing credentials and transport metadata.</param>
     AuthResult? Authenticate(ClientAuthContext context);
 }
 
 public sealed class ClientAuthContext
 {
+    /// <summary>
+    /// Gets CONNECT options and credential fields supplied by the client.
+    /// </summary>
     public required ClientOptions Opts { get; init; }
+
+    /// <summary>
+    /// Gets server-issued nonce bytes used for signature-based auth flows.
+    /// </summary>
     public required byte[] Nonce { get; init; }
+
+    /// <summary>
+    /// Gets the client TLS certificate presented during handshake, when available.
+    /// </summary>
     public X509Certificate2? ClientCertificate { get; init; }
 
     /// <summary>