Refactor code structure and optimize performance across multiple modules

src/Scanner/__Tests/StellaOps.Scanner.WebService.Tests/CallGraphEndpointsTests.cs

@@ -7,7 +7,8 @@ namespace StellaOps.Scanner.WebService.Tests;
 
 public sealed class CallGraphEndpointsTests
 {
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task SubmitCallGraphRequiresContentDigestHeader()
     {
         using var secrets = new TestSurfaceSecretsScope();
@@ -26,7 +27,8 @@ public sealed class CallGraphEndpointsTests
         Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task SubmitCallGraphReturnsAcceptedAndDetectsDuplicates()
     {
         using var secrets = new TestSurfaceSecretsScope();
@@ -59,6 +61,7 @@ public sealed class CallGraphEndpointsTests
         {
             Content = JsonContent.Create(request)
         };
+using StellaOps.TestKit;
         secondRequest.Headers.TryAddWithoutValidation("Content-Digest", "sha256:deadbeef");
 
         var second = await client.SendAsync(secondRequest);