fix(client): alarm filter selected ActiveState/Id as ONE QualifiedName — every event read inactive

EventFilter.AddSelectClause(type, "ActiveState/Id") does not split the string;
it selects a single QualifiedName named "ActiveState/Id", which no event carries.
AckedState/Id, ActiveState/Id and EnabledState/Id therefore always arrived null
and Client.CLI 'alarms' (and Client.UI) reported every alarm inactive and
unacknowledged while a direct Read said Active. Pre-existing since a2883b82;
server-side event delivery was correct (proven with two-element select clauses,
incl. after #629). Select them with explicit two-element browse paths.

Over-the-wire test drives OpcUaClientService.SubscribeAlarmsAsync against the
in-process server (native + scripted); ServerEventRig now also selects
ActiveState/Id, Severity and Retain.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

src/Client/ZB.MOM.WW.OtOpcUa.Client.Shared/OpcUaClientService.cs

@@ -867,7 +867,7 @@ public sealed class OpcUaClientService : IOpcUaClientService
         catch { return false; }
     }
 
-    private static EventFilter CreateAlarmEventFilter()
+    internal static EventFilter CreateAlarmEventFilter()
     {
         var filter = new EventFilter();
         // 0: EventId
@@ -886,12 +886,18 @@ public sealed class OpcUaClientService : IOpcUaClientService
         filter.AddSelectClause(ObjectTypeIds.ConditionType, BrowseNames.ConditionName);
         // 7: Retain
         filter.AddSelectClause(ObjectTypeIds.ConditionType, BrowseNames.Retain);
+        // 8-10: the two-state /Id booleans. Each browse path is TWO QualifiedNames. Passing "AckedState/Id" as a
+        // string to AddSelectClause does not split it — it selects one element NAMED "AckedState/Id", which no
+        // event carries, so all three arrived null and every alarm read inactive + unacknowledged.
         // 8: AckedState/Id
-        filter.AddSelectClause(ObjectTypeIds.AcknowledgeableConditionType, "AckedState/Id");
+        filter.SelectClauses.Add(new SimpleAttributeOperand(
+            ObjectTypeIds.AcknowledgeableConditionType, [BrowseNames.AckedState, BrowseNames.Id]));
         // 9: ActiveState/Id
-        filter.AddSelectClause(ObjectTypeIds.AlarmConditionType, "ActiveState/Id");
+        filter.SelectClauses.Add(new SimpleAttributeOperand(
+            ObjectTypeIds.AlarmConditionType, [BrowseNames.ActiveState, BrowseNames.Id]));
         // 10: EnabledState/Id
-        filter.AddSelectClause(ObjectTypeIds.AlarmConditionType, "EnabledState/Id");
+        filter.SelectClauses.Add(new SimpleAttributeOperand(
+            ObjectTypeIds.ConditionType, [BrowseNames.EnabledState, BrowseNames.Id]));
         // 11: SuppressedOrShelved
         filter.AddSelectClause(ObjectTypeIds.AlarmConditionType, "SuppressedOrShelved");
         // 12: SourceNode (ConditionId for acknowledgment)