feat(scripted-alarms): richer AlarmConditionState bridge to the OPC UA node (T15)

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Applier.cs

@@ -59,12 +59,12 @@ public sealed class Phase7Applier
         var removedCount = 0;
         foreach (var eq in plan.RemovedEquipment)
         {
-            SafeWriteAlarmState(eq.EquipmentId, active: false, acknowledged: false, ts);
+            SafeWriteAlarmCondition(eq.EquipmentId, RemovedConditionState, ts);
             removedCount++;
         }
         foreach (var alarm in plan.RemovedAlarms)
         {
-            SafeWriteAlarmState(alarm.ScriptedAlarmId, active: false, acknowledged: false, ts);
+            SafeWriteAlarmCondition(alarm.ScriptedAlarmId, RemovedConditionState, ts);
             removedCount++;
         }
 
@@ -332,10 +332,22 @@ public sealed class Phase7Applier
         catch (Exception ex) { _logger.LogWarning(ex, "Phase7Applier: EnsureVariable threw for {Node}", nodeId); }
     }
 
-    private void SafeWriteAlarmState(string nodeId, bool active, bool acknowledged, DateTime ts)
+    /// <summary>The "no-event" condition state written to a removed equipment / alarm node before the
+    /// rebuild tears it down: inactive, acked, confirmed, enabled, unshelved, severity 0, empty message.
+    /// Drives Retain to false so a removed condition stops replaying on ConditionRefresh.</summary>
+    private static readonly AlarmConditionSnapshot RemovedConditionState = new(
+        Active: false,
+        Acknowledged: true,
+        Confirmed: true,
+        Enabled: true,
+        Shelving: AlarmShelvingKind.Unshelved,
+        Severity: 0,
+        Message: string.Empty);
+
+    private void SafeWriteAlarmCondition(string nodeId, AlarmConditionSnapshot state, DateTime ts)
     {
-        try { _sink.WriteAlarmState(nodeId, active, acknowledged, ts); }
-        catch (Exception ex) { _logger.LogWarning(ex, "Phase7Applier: WriteAlarmState threw for {Node}", nodeId); }
+        try { _sink.WriteAlarmCondition(nodeId, state, ts); }
+        catch (Exception ex) { _logger.LogWarning(ex, "Phase7Applier: WriteAlarmCondition threw for {Node}", nodeId); }
     }
 
     private void SafeMaterialiseAlarmCondition(string alarmNodeId, string equipmentNodeId, string displayName, string alarmType, int severity)