Refactor code structure and optimize performance across multiple modules

src/Concelier/__Tests/StellaOps.Concelier.Models.Tests/SerializationDeterminismTests.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using StellaOps.Concelier.Models;
 using Xunit;
 
+using StellaOps.TestKit;
 namespace StellaOps.Concelier.Models.Tests;
 
 public sealed class SerializationDeterminismTests
@@ -18,7 +19,8 @@ public sealed class SerializationDeterminismTests
         "ar-SA"
     };
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanonicalSerializer_ProducesStableJsonAcrossCultures()
     {
         var examples = CanonicalExampleFactory.GetExamples().ToArray();