fix(alarms): historize the operator (not 'system') for CommentAdded transitions (review)

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/ScriptedAlarms/ScriptedAlarmHostActor.cs

@@ -502,11 +502,14 @@ public sealed class ScriptedAlarmHostActor : ReceiveActor
 
     /// <summary>The acting user for an <see cref="AlarmTransitionEvent"/>. Engine-driven
     /// Activated / Cleared transitions are <c>"system"</c>; operator Acknowledged / Confirmed carry the
-    /// recorded user from the condition state, falling back to <c>"system"</c> when none was recorded.</summary>
+    /// recorded user from the condition state, falling back to <c>"system"</c> when none was recorded.
+    /// CommentAdded carries the commenter's identity from the last entry in
+    /// <see cref="AlarmConditionState.Comments"/>.</summary>
     private static string TransitionUser(ScriptedAlarmEvent e) => e.Emission switch
     {
         EmissionKind.Acknowledged => e.Condition.LastAckUser ?? "system",
         EmissionKind.Confirmed => e.Condition.LastConfirmUser ?? "system",
+        EmissionKind.CommentAdded => e.Condition.Comments.Count > 0 ? e.Condition.Comments[^1].User : "system",
         _ => "system",
     };