fix(IPC-36,IPC-37): guard secondary contracts

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/WnWrapAlarmConsumer.cs

@@ -5,6 +5,7 @@ using System.Globalization;
 using System.Runtime.InteropServices;
 using System.Xml;
 using WNWRAPCONSUMERLib;
+using ZB.MOM.WW.MxGateway.Contracts;
 
 namespace ZB.MOM.WW.MxGateway.Worker.MxAccess;
 
@@ -75,9 +76,6 @@ public sealed class WnWrapAlarmConsumer : IMxAccessAlarmConsumer
     ///     <see cref="DefaultMaxAlarmsPerFetch"/> — a bad environment value
     ///     must never keep the alarm consumer from starting.
     /// </summary>
-    internal const string MaxAlarmsPerFetchEnvironmentVariableName =
-        "MXGATEWAY_ALARM_MAX_ALARMS_PER_FETCH";
-
     /// <summary>
     ///     Minimum gap between truncated-fetch warnings. A galaxy parked above
     ///     the cap truncates on *every* poll, so an unthrottled warning would
@@ -156,7 +154,7 @@ public sealed class WnWrapAlarmConsumer : IMxAccessAlarmConsumer
     /// <returns>The cap passed to <c>GetXmlCurrentAlarms2</c>.</returns>
     internal static int ResolveMaxAlarmsPerFetch()
     {
-        string? value = Environment.GetEnvironmentVariable(MaxAlarmsPerFetchEnvironmentVariableName);
+        string? value = Environment.GetEnvironmentVariable(WorkerLaunchEnvironment.MaxAlarmsPerFetch);
         return int.TryParse(
                 value,
                 NumberStyles.Integer,