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

src/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/DeferredAddressSpaceSink.cs

@@ -32,6 +32,14 @@ public sealed class DeferredAddressSpaceSink : IOpcUaAddressSpaceSink, ISurgical
     // (actors inject THIS wrapper, not the inner SdkAddressSpaceSink) — same trap as WireAlarmNotifiers above.
     public void WriteValues(IReadOnlyList<ValueWrite> values) => _inner.WriteValues(values);
 
+    /// <inheritdoc />
+    // Forward the status-only batch (03/S15). Unforwarded, the interface's DEFAULT runs here instead —
+    // and that default writes a NULL value, so a comms-loss annotation would erase the last known value
+    // of every node on the driver rather than retaining it, on every driver-role host (actors inject
+    // THIS wrapper, not the inner SdkAddressSpaceSink). Same trap as WriteValues / WireAlarmNotifiers
+    // above, except this one degrades to wrong data rather than to slow.
+    public void WriteStatuses(IReadOnlyList<StatusWrite> statuses) => _inner.WriteStatuses(statuses);
+
     /// <inheritdoc />
     public void WriteAlarmCondition(string alarmNodeId, AlarmConditionSnapshot state, DateTime sourceTimestampUtc, AddressSpaceRealm realm)
         => _inner.WriteAlarmCondition(alarmNodeId, state, sourceTimestampUtc, realm);