docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Client/ZB.MOM.WW.OtOpcUa.Client.Shared/OpcUaClientService.cs

@@ -24,7 +24,6 @@ public sealed class OpcUaClientService : IOpcUaClientService
     // Serialises SubscribeAlarmsAsync / UnsubscribeAlarmsAsync so concurrent callers
     // cannot both pass the _alarmSubscription == null check and create duplicate event
     // subscriptions. Capacity 1 = at most one waiter; async-friendly (no thread-block).
-    // (Client.Shared-013)
     private readonly SemaphoreSlim _alarmSubscribeSemaphore = new(1, 1);
 
     // Track active data subscriptions for replay after failover
@@ -137,7 +136,7 @@ public sealed class OpcUaClientService : IOpcUaClientService
         var endpointUrl = _session?.EndpointUrl ?? _settings?.EndpointUrl ?? string.Empty;
 
         // Snapshot the subscription adapter references under the lock so a concurrent
-        // RunFailoverAsync that nulls _dataSubscription / _alarmSubscription (Client.Shared-012)
+        // RunFailoverAsync that nulls _dataSubscription / _alarmSubscription
         // cannot invalidate the references between the null-check and the DeleteAsync call.
         ISubscriptionAdapter? dataSubscription;
         ISubscriptionAdapter? alarmSubscription;
@@ -303,7 +302,7 @@ public sealed class OpcUaClientService : IOpcUaClientService
         ThrowIfDisposed();
         ThrowIfNotConnected();
 
-        // Serialise check-and-create under the semaphore (Client.Shared-013): concurrent
+        // Serialise check-and-create under the semaphore: concurrent
         // callers cannot both pass the null-check and create duplicate alarm subscriptions.
         // The semaphore is async-friendly; the subscription I/O runs inside the critical section.
         await _alarmSubscribeSemaphore.WaitAsync(ct);