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.Browser/OpcUaClientDriverBrowser.cs

@@ -124,17 +124,13 @@ public sealed class OpcUaClientDriverBrowser : IDriverBrowser
     /// <param name="ct">Cancellation token for the configuration build.</param>
     private static async Task<ApplicationConfiguration> BuildBrowseAppConfigurationAsync(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-        // The default ctor is obsolete in favour of the ITelemetryContext overload; suppress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 browser
-        // emits no per-request telemetry of its own and the SDK's internal fallback is fine
-        // for a transient picker session (mirrors the runtime driver's same suppression).
-#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.
+        var app = new ApplicationInstance(BrowseTelemetry.Context)
         {
             ApplicationName = "OtOpcUa AdminUI Browse",
             ApplicationType = ApplicationType.Client,
         };
-#pragma warning restore CS0618
 
         var pkiRoot = Path.Combine(
             Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
@@ -245,3 +241,11 @@ public sealed class OpcUaClientDriverBrowser : IDriverBrowser
     private static string ShortName(string uri) =>
         uri?.Substring(uri.LastIndexOf('#') + 1) ?? "(null)";
 }
+
+internal static class BrowseTelemetry
+{
+    private static readonly Lazy<Opc.Ua.ITelemetryContext> Instance = new(() => Opc.Ua.DefaultTelemetry.Create(_ => { }));
+
+    /// <summary>Gets the shared telemetry context.</summary>
+    public static Opc.Ua.ITelemetryContext Context => Instance.Value;
+}