Refactor code structure and optimize performance across multiple modules

src/Concelier/__Tests/StellaOps.Concelier.Connector.Vndr.Msrc.Tests/MsrcConnectorTests.cs

@@ -43,10 +43,12 @@ public sealed class MsrcConnectorTests : IAsyncLifetime
         _handler = new CannedHttpMessageHandler();
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task FetchParseMap_ProducesCanonicalAdvisory()
     {
         await using var provider = await BuildServiceProviderAsync();
+using StellaOps.TestKit;
         SeedResponses();
 
         var connector = provider.GetRequiredService<MsrcConnector>();