fix(template-engine): computed-alarm IsMesReportable in revision hash and diff, true-only (ScadaBridge#102 item 2)

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Flattening/DiffService.cs

@@ -142,6 +142,7 @@ public class DiffService
         a.Description == b.Description &&
         a.PriorityLevel == b.PriorityLevel &&
         a.IsLocked == b.IsLocked &&
+        a.IsMesReportable == b.IsMesReportable &&
         a.TriggerType == b.TriggerType &&
         a.TriggerConfiguration == b.TriggerConfiguration &&
         a.OnTriggerScriptCanonicalName == b.OnTriggerScriptCanonicalName;

src/ZB.MOM.WW.ScadaBridge.TemplateEngine/Flattening/RevisionHashService.cs

@@ -78,6 +78,8 @@ public class RevisionHashService
                     Description = a.Description,
                     PriorityLevel = a.PriorityLevel,
                     IsLocked = a.IsLocked,
+                    // true-only (null when false) so existing revision hashes are unchanged.
+                    IsMesReportable = a.IsMesReportable ? true : null,
                     TriggerType = a.TriggerType,
                     TriggerConfiguration = a.TriggerConfiguration,
                     OnTriggerScriptCanonicalName = a.OnTriggerScriptCanonicalName
@@ -242,6 +244,11 @@ public class RevisionHashService
         /// </summary>
         public bool IsLocked { get; init; }
         /// <summary>
+        /// MES-reportable flag; null when false (the serializer drops nulls), so
+        /// pre-existing configurations hash identically.
+        /// </summary>
+        public bool? IsMesReportable { get; init; }
+        /// <summary>
         /// The canonical name of the script triggered by this alarm.
         /// </summary>
         public string? OnTriggerScriptCanonicalName { get; init; }