feat(alarms): native condition Acknowledge routes to NativeAlarmAckRouter with principal [H6c]

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

@@ -0,0 +1,20 @@
+namespace ZB.MOM.WW.OtOpcUa.OpcUaServer;
+
+/// <summary>
+///     H6c — the payload routed when an OPC UA client Acknowledges a NATIVE (driver-fed, e.g. Galaxy)
+///     Part 9 condition. The scripted-alarm engine does not own native conditions, so the node manager
+///     branches a native condition's inbound Acknowledge to a separate
+///     <see cref="OtOpcUaNodeManager.NativeAlarmAckRouter"/> seam (the host later wires it to the backing
+///     driver) instead of the scripted <see cref="OtOpcUaNodeManager.AlarmCommandRouter"/>.
+///     <para>
+///         This record is intentionally OpcUaServer-local (the smallest scope) and Akka-free: it carries
+///         exactly what the driver-bound router needs — the condition node id to resolve back to a driver
+///         ref, the operator's acknowledge comment, and the authenticated operator's display name.
+///     </para>
+/// </summary>
+/// <param name="ConditionNodeId">The acknowledged condition's folder-scoped NodeId identifier string
+/// (the same value the <c>DriverHostActor</c> inverse map keys native conditions by), used to resolve the
+/// command back to its backing driver + alarm ref.</param>
+/// <param name="Comment">The operator's acknowledge comment text, or <c>null</c> when none was supplied.</param>
+/// <param name="OperatorUser">The authenticated operator's display name (empty when none resolves).</param>
+public sealed record NativeAlarmAck(string ConditionNodeId, string? Comment, string OperatorUser);