refactor: ScadaBridge module options registration -> AddValidatedOptions; clarify De Morgan predicates

src/ZB.MOM.WW.ScadaBridge.HealthMonitoring/HealthMonitoringOptionsValidator.cs

@@ -35,6 +35,12 @@ public sealed class HealthMonitoringOptionsValidator : OptionsValidatorBase<Heal
             $"ScadaBridge:HealthMonitoring:CentralOfflineTimeout must be a positive duration " +
             $"(was {options.CentralOfflineTimeout}).");
 
+        // Valid when CentralOfflineTimeout >= OfflineTimeout (both already
+        // required to be positive above). The De Morgan'd guard !(both positive
+        // AND Central < Offline) is true unless BOTH timeouts are positive and
+        // Central is strictly smaller — so it stays silent when either field is
+        // non-positive, leaving that failure to the dedicated positive-duration
+        // checks above rather than double-firing here.
         builder.RequireThat(
             !(options.OfflineTimeout > TimeSpan.Zero
               && options.CentralOfflineTimeout > TimeSpan.Zero