feat(client): AddComment + comment CLI, drop Galaxy-era alarm fallback, serialize CLI tests (#598); Client.Shared off obsolete sync SDK APIs (#621)

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

src/Client/ZB.MOM.WW.OtOpcUa.Client.Shared/Adapters/DefaultSessionFactory.cs

@@ -23,14 +23,18 @@ internal sealed class DefaultSessionFactory : ISessionFactory
         var endpointConfig = EndpointConfiguration.Create(config);
         var configuredEndpoint = new ConfiguredEndpoint(null, endpoint, endpointConfig);
 
-        var session = await Session.Create(
+        var created = await new Opc.Ua.Client.DefaultSessionFactory(ClientTelemetry.Context).CreateAsync(
             config,
             configuredEndpoint,
             false,
             sessionName,
             sessionTimeoutMs,
             identity,
-            null);
+            null,
+            ct);
+        var session = created as Session
+            ?? throw new InvalidOperationException(
+                $"Session factory returned {created.GetType().Name}, expected {nameof(Session)}.");
 
         Logger.Information("Session created: {SessionName} -> {EndpointUrl}", sessionName, endpoint.EndpointUrl);
         return new DefaultSessionAdapter(session);