feat(opcua): IOpcUaAddressSpaceSink.WriteStatuses — status-only batch write retaining the node value (03/S15)

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

@@ -31,6 +31,13 @@ public sealed class SdkAddressSpaceSink : IOpcUaAddressSpaceSink, ISurgicalAddre
     public void WriteValues(IReadOnlyList<ValueWrite> values)
         => _nodeManager.WriteValues(values);
 
+    /// <inheritdoc />
+    /// <remarks>Overrides the interface's default on purpose, and here the default is not merely slower but
+    /// <b>wrong</b>: it writes a null value (a value-less sink has nothing else to write), which would erase
+    /// the last known value this annotation exists to preserve. The manager's own entry point retains it.</remarks>
+    public void WriteStatuses(IReadOnlyList<StatusWrite> statuses)
+        => _nodeManager.WriteStatuses(statuses);
+
     /// <inheritdoc />
     public void WriteAlarmCondition(string alarmNodeId, AlarmConditionSnapshot state, DateTime sourceTimestampUtc, AddressSpaceRealm realm)
         => _nodeManager.WriteAlarmCondition(alarmNodeId, state, sourceTimestampUtc, realm);