Fix build and code structure improvements. New but essential UI functionality. CI improvements. Documentation improvements. AI module improvements.

src/Authority/StellaOps.Authority/StellaOps.Auth.Client.Tests/ServiceCollectionExtensionsTests.cs

@@ -1,3 +1,5 @@
+#pragma warning disable CS0618 // ConfigureHttpMessageHandlerBuilder is obsolete - test validates legacy handler configuration
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -216,7 +218,6 @@ public class ServiceCollectionExtensionsTests
             });
 
         using var provider = services.BuildServiceProvider();
-using StellaOps.TestKit;
         var client = provider.GetRequiredService<IHttpClientFactory>().CreateClient("notify");
 
         await client.GetAsync("https://notify.example/api");