audit work, fixed StellaOps.sln warnings/errors, fixed tests, sprints work, new advisories

src/Cli/StellaOps.Cli/Commands/CommandHandlers.Secrets.cs

@@ -5,6 +5,7 @@
 // Description: Implements bundle create, verify, and info commands.
 // -----------------------------------------------------------------------------
 
+using System.Globalization;
 using System.Text.Json;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
@@ -270,7 +271,7 @@ internal static partial class CommandHandlers
                     version = result.BundleVersion,
                     ruleCount = result.RuleCount,
                     signerKeyId = result.SignerKeyId,
-                    signedAt = result.SignedAt?.ToString("O"),
+                    signedAt = result.SignedAt?.ToString("O", CultureInfo.InvariantCulture),
                     errors = result.ValidationErrors,
                     warnings = result.ValidationWarnings
                 };