Refactor code structure and optimize performance across multiple modules

src/__Tests/Graph/StellaOps.Graph.Indexer.Tests/GraphIdentityTests.cs

@@ -4,6 +4,7 @@ using FluentAssertions;
 using StellaOps.Graph.Indexer.Schema;
 using Xunit;
 
+using StellaOps.TestKit;
 namespace StellaOps.Graph.Indexer.Tests;
 
 public sealed class GraphIdentityTests
@@ -11,7 +12,8 @@ public sealed class GraphIdentityTests
     private static readonly string FixturesRoot =
         Path.Combine(AppContext.BaseDirectory, "Fixtures", "v1");
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void NodeIds_are_stable()
     {
         var nodes = LoadArray("nodes.json");
@@ -40,7 +42,8 @@ public sealed class GraphIdentityTests
         }
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void EdgeIds_are_stable()
     {
         var edges = LoadArray("edges.json");
@@ -69,7 +72,8 @@ public sealed class GraphIdentityTests
         }
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void AttributeCoverage_matches_matrix()
     {
         var matrix = LoadObject("schema-matrix.json");