feat(worker): acknowledge alarms via authenticated AckMsg write

Claude-Session: https://claude.ai/code/session_016J6isfcgqy4SB2RK3ZvFvT

src/ZB.MOM.WW.MxGateway.Worker/MxAccess/IAlarmAckWriter.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace ZB.MOM.WW.MxGateway.Worker.MxAccess;
+
+/// <summary>
+///     Acknowledges an alarm by writing its MXAccess ack item (<c>AckMsg</c>)
+///     after authenticating as the operator. Must be called on the worker STA.
+/// </summary>
+public interface IAlarmAckWriter : IDisposable
+{
+    /// <summary>Authenticates <paramref name="ackOperator"/> and writes <paramref name="comment"/> to <paramref name="itemAddress"/>.</summary>
+    /// <param name="itemAddress">The ack item, e.g. <c>Obj.Alarm.AckMsg</c>.</param>
+    /// <param name="comment">The acknowledgement comment.</param>
+    /// <param name="ackOperator">The operator to authenticate as.</param>
+    /// <returns>The outcome.</returns>
+    AlarmAckResult Acknowledge(string itemAddress, string comment, AlarmAckOperator ackOperator);
+}