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

src/Signals/__Tests/StellaOps.Signals.Tests/UnknownsDecayServiceTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
@@ -310,7 +310,6 @@ public class UnknownsDecayServiceTests
         }
 
         using var cts = new CancellationTokenSource();
-using StellaOps.TestKit;
         cts.Cancel();
 
         await Assert.ThrowsAsync<OperationCanceledException>(() =>