Refactor code structure and optimize performance across multiple modules

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

@@ -6,11 +6,13 @@ namespace StellaOps.Policy.Tests;
 
 public class SplSchemaResourceTests
 {
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Schema_IncludesReachabilityAndExploitability()
     {
         var schema = SplSchemaResource.GetSchema();
         using var doc = JsonDocument.Parse(schema);
+using StellaOps.TestKit;
         var match = doc.RootElement
             .GetProperty("properties")
             .GetProperty("spec")