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.Server/Alarms/AlarmWatchListResolver.cs

@@ -10,14 +10,6 @@ namespace ZB.MOM.WW.MxGateway.Server.Alarms;
 ///     and composes the per-attribute subtag item addresses from the configured
 ///     subtag names.
 /// </summary>
-// NOTE: The exact subtag names and the canonical AlarmFullReference shape
-// ("Galaxy!{area}.{reference}") are validated against a live Galaxy in the
-// Task 17 live smoke test. The config Subtags block exists precisely so these
-// names are not hard-coded here. The {area} is the alarm object's REAL Galaxy
-// area discovered via gobject.area_gobject_id (the alarm group the native
-// alarmmgr emits), giving exact reference parity with wnwrap. The configured
-// Discovery.Area/DefaultArea is only the fallback for explicit IncludeAttributes
-// entries, which carry no discovered area.
 public sealed class AlarmWatchListResolver : IAlarmWatchListResolver
 {
     private const string ProviderLiteral = "Galaxy";

src/ZB.MOM.WW.MxGateway.Server/Alarms/GatewayAlarmMonitor.cs

@@ -912,6 +912,7 @@ public sealed class GatewayAlarmMonitor : BackgroundService, IGatewayAlarmServic
 
         /// <summary>Determines whether the alarm reference matches this subscriber's filter.</summary>
         /// <param name="reference">The alarm reference to match.</param>
+        /// <returns><see langword="true"/> if the reference matches this subscriber's prefix filter.</returns>
         public bool Matches(string reference)
         {
             return prefix.Length == 0 || reference.StartsWith(prefix, StringComparison.Ordinal);

src/ZB.MOM.WW.MxGateway.Server/Alarms/IGatewayAlarmService.cs

@@ -46,6 +46,7 @@ public interface IGatewayAlarmService
     /// </summary>
     /// <param name="alarmFilterPrefix">Optional alarm-reference prefix scoping the feed.</param>
     /// <param name="cancellationToken">Token that ends the subscription.</param>
+    /// <returns>An asynchronous stream of alarm feed messages.</returns>
     IAsyncEnumerable<AlarmFeedMessage> StreamAsync(
         string? alarmFilterPrefix,
         CancellationToken cancellationToken);
@@ -57,6 +58,7 @@ public interface IGatewayAlarmService
     /// </summary>
     /// <param name="request">The acknowledge request.</param>
     /// <param name="cancellationToken">Token to cancel the call.</param>
+    /// <returns>The acknowledge reply, carrying the outcome in its protocol status.</returns>
     Task<AcknowledgeAlarmReply> AcknowledgeAsync(
         AcknowledgeAlarmRequest request,
         CancellationToken cancellationToken);