chore(build): OpcUaClient driver/browser on ITelemetryContext ctors, TreatWarningsAsErrors on remaining src projects (#621 #606)

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

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient/OpcUaClientDriver.cs

@@ -294,17 +294,13 @@ public sealed class OpcUaClientDriver : IDriver, ITagDiscovery, IReadable, IWrit
     /// </summary>
     private async Task<ApplicationConfiguration> BuildApplicationConfigurationAsync(CancellationToken ct)
     {
-        // The default ctor is obsolete in favour of the ITelemetryContext overload; suppress
-        // locally rather than plumbing a telemetry context all the way through the driver
-        // surface — the driver emits no per-request telemetry of its own and the SDK's
-        // internal fallback is fine for a gateway use case.
-#pragma warning disable CS0618
-        var app = new ApplicationInstance
+        // The ITelemetryContext overload is the non-obsolete ctor; an empty builder keeps SDK
+        // internals off any logging provider (mirrors Client.Shared's ClientTelemetry).
+        var app = new ApplicationInstance(SdkTelemetry.Context)
         {
             ApplicationName = _options.SessionName,
             ApplicationType = ApplicationType.Client,
         };
-#pragma warning restore CS0618
 
         var pkiRoot = Path.Combine(
             Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
@@ -472,7 +468,7 @@ public sealed class OpcUaClientDriver : IDriver, ITagDiscovery, IReadable, IWrit
         endpointConfig.OperationTimeout = (int)_options.Timeout.TotalMilliseconds;
         var endpoint = new ConfiguredEndpoint(null, selected, endpointConfig);
 
-        var session = await new DefaultSessionFactory(telemetry: null!).CreateAsync(
+        var session = await new DefaultSessionFactory(SdkTelemetry.Context).CreateAsync(
             appConfig,
             endpoint,
             false,                                              // updateBeforeConnect