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

src/Policy/__Tests/StellaOps.Policy.Tests/SplLayeringEngineTests.cs

@@ -1,4 +1,4 @@
-using System.Text.Json;
+using System.Text.Json;
 using StellaOps.Policy;
 using Xunit;
 
@@ -61,7 +61,6 @@ public class SplLayeringEngineTests
         var merged = SplLayeringEngine.Merge(baseDoc, overlay);
 
         using var doc = JsonDocument.Parse(merged);
-using StellaOps.TestKit;
         var root = doc.RootElement;
 
         Assert.True(root.TryGetProperty("extras", out var extras) && extras.TryGetProperty("foo", out var foo) && foo.GetInt32() == 1);