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

src/Policy/StellaOps.Policy.Engine/Telemetry/IncidentMode.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics;
+using System.Globalization;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using OpenTelemetry.Trace;
@@ -62,7 +63,7 @@ public sealed class IncidentModeService
         _logger.LogWarning(
             "Incident mode ENABLED. Reason: {Reason}, ExpiresAt: {ExpiresAt}",
             reason,
-            expiresAt?.ToString("O") ?? "never");
+            expiresAt?.ToString("O", CultureInfo.InvariantCulture) ?? "never");
 
         PolicyEngineTelemetry.RecordError("incident_mode_enabled", null);
     }