docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

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

@@ -34,6 +34,7 @@ public interface IAlarmCommandHandler : IDisposable
     /// <param name="operatorNode">The operator node name.</param>
     /// <param name="operatorDomain">The operator domain name.</param>
     /// <param name="operatorFullName">The operator full name.</param>
+    /// <returns>AVEVA's native alarm status code (0 = success).</returns>
     int Acknowledge(
         Guid alarmGuid,
         string comment,
@@ -54,6 +55,7 @@ public interface IAlarmCommandHandler : IDisposable
     /// <param name="operatorNode">The operator node name.</param>
     /// <param name="operatorDomain">The operator domain name.</param>
     /// <param name="operatorFullName">The operator full name.</param>
+    /// <returns>AVEVA's native alarm status code (0 = success).</returns>
     int AcknowledgeByName(
         string alarmName,
         string providerName,
@@ -69,6 +71,7 @@ public interface IAlarmCommandHandler : IDisposable
     ///     prefix matched against <c>AlarmFullReference</c>.
     /// </summary>
     /// <param name="alarmFilterPrefix">Optional prefix to filter alarms by.</param>
+    /// <returns>The currently active alarms matching the filter.</returns>
     IReadOnlyList<ActiveAlarmSnapshot> QueryActive(string? alarmFilterPrefix);
 
     /// <summary>