Refactor code structure and optimize performance across multiple modules

src/Concelier/__Tests/StellaOps.Concelier.Connector.Ics.Cisa.Tests/IcsCisaConnectorTests.cs

@@ -27,10 +27,12 @@ public sealed class IcsCisaConnectorTests
         _fixture = fixture ?? throw new ArgumentNullException(nameof(fixture));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task FetchParseMap_EndToEnd_ProducesCanonicalAdvisories()
     {
         await using var harness = await BuildHarnessAsync();
+using StellaOps.TestKit;
         RegisterResponses(harness.Handler);
 
         var connector = harness.ServiceProvider.GetRequiredService<IcsCisaConnector>();