Refactor code structure and optimize performance across multiple modules

src/__Libraries/StellaOps.Evidence.Core.Tests/EvidenceRecordTests.cs

@@ -18,7 +18,8 @@ public class EvidenceRecordTests
 
     #region ComputeEvidenceId
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_ValidInputs_ReturnsSha256Prefixed()
     {
         var subjectId = "sha256:abc123";
@@ -34,7 +35,8 @@ public class EvidenceRecordTests
         Assert.Equal(71, evidenceId.Length); // "sha256:" + 64 hex chars
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_SameInputs_ReturnsSameId()
     {
         var subjectId = "sha256:abc123";
@@ -46,7 +48,8 @@ public class EvidenceRecordTests
         Assert.Equal(id1, id2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_DifferentSubjects_ReturnsDifferentIds()
     {
         var payload = Encoding.UTF8.GetBytes("""{"vulnerability":"CVE-2021-44228"}""");
@@ -57,7 +60,8 @@ public class EvidenceRecordTests
         Assert.NotEqual(id1, id2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_DifferentTypes_ReturnsDifferentIds()
     {
         var subjectId = "sha256:abc123";
@@ -69,7 +73,8 @@ public class EvidenceRecordTests
         Assert.NotEqual(id1, id2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_DifferentPayloads_ReturnsDifferentIds()
     {
         var subjectId = "sha256:abc123";
@@ -82,7 +87,8 @@ public class EvidenceRecordTests
         Assert.NotEqual(id1, id2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_DifferentProvenance_ReturnsDifferentIds()
     {
         var subjectId = "sha256:abc123";
@@ -108,7 +114,8 @@ public class EvidenceRecordTests
         Assert.NotEqual(id1, id2);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_NullSubject_ThrowsArgumentException()
     {
         var payload = Encoding.UTF8.GetBytes("""{"data":"test"}""");
@@ -116,7 +123,8 @@ public class EvidenceRecordTests
             EvidenceRecord.ComputeEvidenceId(null!, EvidenceType.Scan, payload, TestProvenance));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_EmptySubject_ThrowsArgumentException()
     {
         var payload = Encoding.UTF8.GetBytes("""{"data":"test"}""");
@@ -124,7 +132,8 @@ public class EvidenceRecordTests
             EvidenceRecord.ComputeEvidenceId("", EvidenceType.Scan, payload, TestProvenance));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_NullProvenance_ThrowsArgumentNullException()
     {
         var payload = Encoding.UTF8.GetBytes("""{"data":"test"}""");
@@ -136,7 +145,8 @@ public class EvidenceRecordTests
 
     #region Create Factory Method
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Create_ValidInputs_ReturnsRecordWithComputedId()
     {
         var subjectId = "sha256:abc123";
@@ -158,7 +168,8 @@ public class EvidenceRecordTests
         Assert.Null(record.ExternalPayloadCid);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Create_WithSignatures_IncludesSignatures()
     {
         var subjectId = "sha256:abc123";
@@ -184,7 +195,8 @@ public class EvidenceRecordTests
         Assert.Equal("key-123", record.Signatures[0].SignerId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Create_WithExternalCid_IncludesCid()
     {
         var subjectId = "sha256:abc123";
@@ -198,6 +210,7 @@ public class EvidenceRecordTests
             "reachability/v1",
             externalPayloadCid: "bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi");
 
+using StellaOps.TestKit;
         Assert.Equal("bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi", record.ExternalPayloadCid);
     }
 
@@ -205,7 +218,8 @@ public class EvidenceRecordTests
 
     #region VerifyIntegrity
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void VerifyIntegrity_ValidRecord_ReturnsTrue()
     {
         var record = EvidenceRecord.Create(
@@ -218,7 +232,8 @@ public class EvidenceRecordTests
         Assert.True(record.VerifyIntegrity());
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void VerifyIntegrity_TamperedPayload_ReturnsFalse()
     {
         var originalPayload = Encoding.UTF8.GetBytes("""{"vulnerability":"CVE-2021-44228"}""");
@@ -237,7 +252,8 @@ public class EvidenceRecordTests
         Assert.False(tampered.VerifyIntegrity());
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void VerifyIntegrity_TamperedSubject_ReturnsFalse()
     {
         var record = EvidenceRecord.Create(
@@ -256,7 +272,8 @@ public class EvidenceRecordTests
 
     #region Determinism
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Create_SameInputs_ProducesSameEvidenceId()
     {
         var subjectId = "sha256:abc123";
@@ -271,7 +288,8 @@ public class EvidenceRecordTests
         Assert.Single(ids);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void ComputeEvidenceId_EmptyPayload_Works()
     {
         var id = EvidenceRecord.ComputeEvidenceId(

src/__Libraries/StellaOps.Evidence.Core.Tests/ExceptionApplicationAdapterTests.cs

@@ -6,6 +6,7 @@ using System.Collections.Immutable;
 using StellaOps.Evidence.Core;
 using StellaOps.Evidence.Core.Adapters;
 
+using StellaOps.TestKit;
 namespace StellaOps.Evidence.Core.Tests;
 
 public sealed class ExceptionApplicationAdapterTests
@@ -24,7 +25,8 @@ public sealed class ExceptionApplicationAdapterTests
         };
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithValidApplication_ReturnsTrue()
     {
         var application = CreateValidApplication();
@@ -34,7 +36,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.True(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithNullApplication_ReturnsFalse()
     {
         var result = _adapter.CanConvert(null!);
@@ -42,7 +45,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithEmptyExceptionId_ReturnsFalse()
     {
         var application = CreateValidApplication() with { ExceptionId = "" };
@@ -52,7 +56,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithEmptyFindingId_ReturnsFalse()
     {
         var application = CreateValidApplication() with { FindingId = "" };
@@ -62,7 +67,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_CreatesSingleRecord()
     {
         var application = CreateValidApplication();
@@ -72,7 +78,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Single(results);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasExceptionType()
     {
         var application = CreateValidApplication();
@@ -82,7 +89,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Equal(EvidenceType.Exception, results[0].EvidenceType);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasCorrectSubjectNodeId()
     {
         var application = CreateValidApplication();
@@ -92,7 +100,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Equal(_subjectNodeId, results[0].SubjectNodeId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasNonEmptyPayload()
     {
         var application = CreateValidApplication();
@@ -102,7 +111,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasPayloadSchemaVersion()
     {
         var application = CreateValidApplication();
@@ -112,7 +122,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Equal("1.0.0", results[0].PayloadSchemaVersion);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasEmptySignatures()
     {
         var application = CreateValidApplication();
@@ -122,7 +133,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Empty(results[0].Signatures);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_UsesProvidedProvenance()
     {
         var application = CreateValidApplication();
@@ -133,7 +145,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Equal(_provenance.GeneratorVersion, results[0].Provenance.GeneratorVersion);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasUniqueEvidenceId()
     {
         var application = CreateValidApplication();
@@ -144,7 +157,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.NotEmpty(results[0].EvidenceId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithNullSubjectNodeId_ThrowsArgumentNullException()
     {
         var application = CreateValidApplication();
@@ -153,7 +167,8 @@ public sealed class ExceptionApplicationAdapterTests
             _adapter.Convert(application, null!, _provenance));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithEmptySubjectNodeId_ThrowsArgumentException()
     {
         var application = CreateValidApplication();
@@ -162,7 +177,8 @@ public sealed class ExceptionApplicationAdapterTests
             _adapter.Convert(application, "", _provenance));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithNullProvenance_ThrowsArgumentNullException()
     {
         var application = CreateValidApplication();
@@ -171,7 +187,8 @@ public sealed class ExceptionApplicationAdapterTests
             _adapter.Convert(application, _subjectNodeId, null!));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithVulnerabilityId_IncludesInPayload()
     {
         var application = CreateValidApplication() with { VulnerabilityId = "CVE-2024-9999" };
@@ -181,7 +198,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithEvaluationRunId_IncludesInPayload()
     {
         var runId = Guid.NewGuid();
@@ -192,7 +210,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithPolicyBundleDigest_IncludesInPayload()
     {
         var application = CreateValidApplication() with { PolicyBundleDigest = "sha256:policy123" };
@@ -202,7 +221,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithMetadata_IncludesInPayload()
     {
         var metadata = ImmutableDictionary<string, string>.Empty
@@ -216,7 +236,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_DifferentApplications_ProduceDifferentEvidenceIds()
     {
         var app1 = CreateValidApplication() with { ExceptionId = "exc-001" };
@@ -228,7 +249,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.NotEqual(results1[0].EvidenceId, results2[0].EvidenceId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_SameApplicationTwice_ProducesSameEvidenceId()
     {
         var application = CreateValidApplication();
@@ -239,7 +261,8 @@ public sealed class ExceptionApplicationAdapterTests
         Assert.Equal(results1[0].EvidenceId, results2[0].EvidenceId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_AllStatusTransitions_Supported()
     {
         var transitions = new[]

src/__Libraries/StellaOps.Evidence.Core.Tests/InMemoryEvidenceStoreTests.cs

@@ -1,6 +1,7 @@
 using System.Text;
 using Xunit;
 
+using StellaOps.TestKit;
 namespace StellaOps.Evidence.Core.Tests;
 
 /// <summary>
@@ -28,7 +29,8 @@ public class InMemoryEvidenceStoreTests
 
     #region StoreAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreAsync_ValidEvidence_ReturnsEvidenceId()
     {
         var evidence = CreateTestEvidence("sha256:subject1");
@@ -39,7 +41,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(1, _store.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreAsync_DuplicateEvidence_IsIdempotent()
     {
         var evidence = CreateTestEvidence("sha256:subject1");
@@ -50,7 +53,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(1, _store.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreAsync_NullEvidence_ThrowsArgumentNullException()
     {
         await Assert.ThrowsAsync<ArgumentNullException>(() => _store.StoreAsync(null!));
@@ -60,7 +64,8 @@ public class InMemoryEvidenceStoreTests
 
     #region StoreBatchAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreBatchAsync_MultipleRecords_StoresAll()
     {
         var evidence1 = CreateTestEvidence("sha256:subject1");
@@ -73,7 +78,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(3, _store.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreBatchAsync_WithDuplicates_SkipsDuplicates()
     {
         var evidence1 = CreateTestEvidence("sha256:subject1");
@@ -86,7 +92,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(2, _store.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreBatchAsync_EmptyList_ReturnsZero()
     {
         var count = await _store.StoreBatchAsync([]);
@@ -99,7 +106,8 @@ public class InMemoryEvidenceStoreTests
 
     #region GetByIdAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByIdAsync_ExistingEvidence_ReturnsEvidence()
     {
         var evidence = CreateTestEvidence("sha256:subject1");
@@ -112,7 +120,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(evidence.SubjectNodeId, result.SubjectNodeId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByIdAsync_NonExistingEvidence_ReturnsNull()
     {
         var result = await _store.GetByIdAsync("sha256:nonexistent");
@@ -120,13 +129,15 @@ public class InMemoryEvidenceStoreTests
         Assert.Null(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByIdAsync_NullId_ThrowsArgumentException()
     {
         await Assert.ThrowsAnyAsync<ArgumentException>(() => _store.GetByIdAsync(null!));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByIdAsync_EmptyId_ThrowsArgumentException()
     {
         await Assert.ThrowsAnyAsync<ArgumentException>(() => _store.GetByIdAsync(""));
@@ -136,7 +147,8 @@ public class InMemoryEvidenceStoreTests
 
     #region GetBySubjectAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetBySubjectAsync_ExistingSubject_ReturnsAllEvidence()
     {
         var subjectId = "sha256:subject1";
@@ -151,7 +163,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(2, results.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetBySubjectAsync_WithTypeFilter_ReturnsFilteredResults()
     {
         var subjectId = "sha256:subject1";
@@ -167,7 +180,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(EvidenceType.Scan, results[0].EvidenceType);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetBySubjectAsync_NonExistingSubject_ReturnsEmptyList()
     {
         var results = await _store.GetBySubjectAsync("sha256:nonexistent");
@@ -179,7 +193,8 @@ public class InMemoryEvidenceStoreTests
 
     #region GetByTypeAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByTypeAsync_ExistingType_ReturnsMatchingEvidence()
     {
         await _store.StoreAsync(CreateTestEvidence("sha256:sub1", EvidenceType.Scan));
@@ -192,7 +207,8 @@ public class InMemoryEvidenceStoreTests
         Assert.All(results, r => Assert.Equal(EvidenceType.Scan, r.EvidenceType));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByTypeAsync_WithLimit_RespectsLimit()
     {
         for (int i = 0; i < 10; i++)
@@ -205,7 +221,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(5, results.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByTypeAsync_NonExistingType_ReturnsEmptyList()
     {
         await _store.StoreAsync(CreateTestEvidence("sha256:sub1", EvidenceType.Scan));
@@ -219,7 +236,8 @@ public class InMemoryEvidenceStoreTests
 
     #region ExistsAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task ExistsAsync_ExistingEvidenceForType_ReturnsTrue()
     {
         var subjectId = "sha256:subject1";
@@ -230,7 +248,8 @@ public class InMemoryEvidenceStoreTests
         Assert.True(exists);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task ExistsAsync_DifferentType_ReturnsFalse()
     {
         var subjectId = "sha256:subject1";
@@ -241,7 +260,8 @@ public class InMemoryEvidenceStoreTests
         Assert.False(exists);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task ExistsAsync_NonExistingSubject_ReturnsFalse()
     {
         var exists = await _store.ExistsAsync("sha256:nonexistent", EvidenceType.Scan);
@@ -253,7 +273,8 @@ public class InMemoryEvidenceStoreTests
 
     #region DeleteAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task DeleteAsync_ExistingEvidence_ReturnsTrue()
     {
         var evidence = CreateTestEvidence("sha256:subject1");
@@ -265,7 +286,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(0, _store.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task DeleteAsync_NonExistingEvidence_ReturnsFalse()
     {
         var deleted = await _store.DeleteAsync("sha256:nonexistent");
@@ -273,7 +295,8 @@ public class InMemoryEvidenceStoreTests
         Assert.False(deleted);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task DeleteAsync_RemovedEvidence_NotRetrievable()
     {
         var evidence = CreateTestEvidence("sha256:subject1");
@@ -289,7 +312,8 @@ public class InMemoryEvidenceStoreTests
 
     #region CountBySubjectAsync
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task CountBySubjectAsync_MultipleEvidence_ReturnsCorrectCount()
     {
         var subjectId = "sha256:subject1";
@@ -302,7 +326,8 @@ public class InMemoryEvidenceStoreTests
         Assert.Equal(3, count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task CountBySubjectAsync_NoEvidence_ReturnsZero()
     {
         var count = await _store.CountBySubjectAsync("sha256:nonexistent");
@@ -314,7 +339,8 @@ public class InMemoryEvidenceStoreTests
 
     #region Clear
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task Clear_RemovesAllEvidence()
     {
         await _store.StoreAsync(CreateTestEvidence("sha256:sub1"));
@@ -329,7 +355,8 @@ public class InMemoryEvidenceStoreTests
 
     #region Cancellation
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task StoreAsync_CancelledToken_ThrowsOperationCancelledException()
     {
         var cts = new CancellationTokenSource();
@@ -341,7 +368,8 @@ public class InMemoryEvidenceStoreTests
             _store.StoreAsync(evidence, cts.Token));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public async Task GetByIdAsync_CancelledToken_ThrowsOperationCancelledException()
     {
         var cts = new CancellationTokenSource();

src/__Libraries/StellaOps.Evidence.Core.Tests/ProofSegmentAdapterTests.cs

@@ -6,6 +6,7 @@ using System.Collections.Immutable;
 using StellaOps.Evidence.Core;
 using StellaOps.Evidence.Core.Adapters;
 
+using StellaOps.TestKit;
 namespace StellaOps.Evidence.Core.Tests;
 
 public sealed class ProofSegmentAdapterTests
@@ -24,7 +25,8 @@ public sealed class ProofSegmentAdapterTests
         };
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithValidSegment_ReturnsTrue()
     {
         var segment = CreateValidSegment();
@@ -34,7 +36,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.True(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithNullSegment_ReturnsFalse()
     {
         var result = _adapter.CanConvert(null!);
@@ -42,7 +45,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithEmptySegmentId_ReturnsFalse()
     {
         var segment = CreateValidSegment() with { SegmentId = "" };
@@ -52,7 +56,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithEmptyInputHash_ReturnsFalse()
     {
         var segment = CreateValidSegment() with { InputHash = "" };
@@ -62,7 +67,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_CreatesSingleRecord()
     {
         var segment = CreateValidSegment();
@@ -72,7 +78,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Single(results);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasCorrectSubjectNodeId()
     {
         var segment = CreateValidSegment();
@@ -82,7 +89,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Equal(_subjectNodeId, results[0].SubjectNodeId);
     }
 
-    [Theory]
+    [Trait("Category", TestCategories.Unit)]
+        [Theory]
     [InlineData("SbomSlice", EvidenceType.Artifact)]
     [InlineData("Match", EvidenceType.Scan)]
     [InlineData("Reachability", EvidenceType.Reachability)]
@@ -98,7 +106,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Equal(expectedType, results[0].EvidenceType);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_UnknownSegmentType_DefaultsToCustomType()
     {
         var segment = CreateValidSegment() with { SegmentType = "UnknownType" };
@@ -108,7 +117,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Equal(EvidenceType.Custom, results[0].EvidenceType);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasNonEmptyPayload()
     {
         var segment = CreateValidSegment();
@@ -118,7 +128,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasPayloadSchemaVersion()
     {
         var segment = CreateValidSegment();
@@ -128,7 +139,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Equal("proof-segment/v1", results[0].PayloadSchemaVersion);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasEmptySignatures()
     {
         var segment = CreateValidSegment();
@@ -138,7 +150,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Empty(results[0].Signatures);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_UsesProvidedProvenance()
     {
         var segment = CreateValidSegment();
@@ -149,7 +162,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Equal(_provenance.GeneratorVersion, results[0].Provenance.GeneratorVersion);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordHasUniqueEvidenceId()
     {
         var segment = CreateValidSegment();
@@ -160,7 +174,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.NotEmpty(results[0].EvidenceId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithNullSubjectNodeId_ThrowsArgumentNullException()
     {
         var segment = CreateValidSegment();
@@ -169,7 +184,8 @@ public sealed class ProofSegmentAdapterTests
             _adapter.Convert(segment, null!, _provenance));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithNullProvenance_ThrowsArgumentNullException()
     {
         var segment = CreateValidSegment();
@@ -178,7 +194,8 @@ public sealed class ProofSegmentAdapterTests
             _adapter.Convert(segment, _subjectNodeId, null!));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_DifferentSegments_ProduceDifferentEvidenceIds()
     {
         var segment1 = CreateValidSegment() with { SegmentId = "seg-001" };
@@ -190,7 +207,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.NotEqual(results1[0].EvidenceId, results2[0].EvidenceId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_SameSegmentTwice_ProducesSameEvidenceId()
     {
         var segment = CreateValidSegment();
@@ -201,7 +219,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Equal(results1[0].EvidenceId, results2[0].EvidenceId);
     }
 
-    [Theory]
+    [Trait("Category", TestCategories.Unit)]
+        [Theory]
     [InlineData("Pending")]
     [InlineData("Verified")]
     [InlineData("Partial")]
@@ -216,7 +235,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.Single(results);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithToolInfo_IncludesInPayload()
     {
         var segment = CreateValidSegment() with
@@ -230,7 +250,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithPrevSegmentHash_IncludesInPayload()
     {
         var segment = CreateValidSegment() with { PrevSegmentHash = "sha256:prevhash" };
@@ -240,7 +261,8 @@ public sealed class ProofSegmentAdapterTests
         Assert.False(results[0].Payload.IsEmpty);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithSpineId_IncludesInPayload()
     {
         var segment = CreateValidSegment() with { SpineId = "spine-001" };

src/__Libraries/StellaOps.Evidence.Core.Tests/StellaOps.Evidence.Core.Tests.csproj

@@ -24,5 +24,6 @@
 
   <ItemGroup>
     <ProjectReference Include="..\StellaOps.Evidence.Core\StellaOps.Evidence.Core.csproj" />
+    <ProjectReference Include="../StellaOps.TestKit/StellaOps.TestKit.csproj" />
   </ItemGroup>
 </Project>

src/__Libraries/StellaOps.Evidence.Core.Tests/VexObservationAdapterTests.cs

@@ -6,6 +6,7 @@ using System.Collections.Immutable;
 using StellaOps.Evidence.Core;
 using StellaOps.Evidence.Core.Adapters;
 
+using StellaOps.TestKit;
 namespace StellaOps.Evidence.Core.Tests;
 
 public sealed class VexObservationAdapterTests
@@ -24,7 +25,8 @@ public sealed class VexObservationAdapterTests
         };
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithValidObservation_ReturnsTrue()
     {
         var observation = CreateValidObservation();
@@ -34,7 +36,8 @@ public sealed class VexObservationAdapterTests
         Assert.True(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithNullObservation_ReturnsFalse()
     {
         var result = _adapter.CanConvert(null!);
@@ -42,7 +45,8 @@ public sealed class VexObservationAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithEmptyObservationId_ReturnsFalse()
     {
         var observation = CreateValidObservation() with { ObservationId = "" };
@@ -52,7 +56,8 @@ public sealed class VexObservationAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void CanConvert_WithEmptyProviderId_ReturnsFalse()
     {
         var observation = CreateValidObservation() with { ProviderId = "" };
@@ -62,7 +67,8 @@ public sealed class VexObservationAdapterTests
         Assert.False(result);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_CreatesObservationLevelRecord()
     {
         var observation = CreateValidObservation();
@@ -75,7 +81,8 @@ public sealed class VexObservationAdapterTests
         Assert.Equal(_subjectNodeId, observationRecord.SubjectNodeId);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_CreatesStatementRecordsForEachStatement()
     {
         var statements = ImmutableArray.Create(
@@ -100,7 +107,8 @@ public sealed class VexObservationAdapterTests
         }
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithSingleStatement_CreatesCorrectRecords()
     {
         var observation = CreateValidObservation();
@@ -111,7 +119,8 @@ public sealed class VexObservationAdapterTests
         Assert.Equal(2, results.Count);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithEmptyStatements_CreatesOnlyObservationRecord()
     {
         var observation = CreateValidObservation() with { Statements = [] };
@@ -122,7 +131,8 @@ public sealed class VexObservationAdapterTests
         Assert.Equal(EvidenceType.Provenance, results[0].EvidenceType);
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithSignature_IncludesSignatureInRecords()
     {
         var signature = new VexObservationSignatureInput
@@ -147,7 +157,8 @@ public sealed class VexObservationAdapterTests
         }
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithoutSignature_CreatesRecordsWithEmptySignatures()
     {
         var signature = new VexObservationSignatureInput
@@ -169,7 +180,8 @@ public sealed class VexObservationAdapterTests
         }
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_UsesProvidedProvenance()
     {
         var observation = CreateValidObservation();
@@ -183,7 +195,8 @@ public sealed class VexObservationAdapterTests
         }
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithNullSubjectNodeId_ThrowsArgumentNullException()
     {
         var observation = CreateValidObservation();
@@ -192,7 +205,8 @@ public sealed class VexObservationAdapterTests
             _adapter.Convert(observation, null!, _provenance));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_WithNullProvenance_ThrowsArgumentNullException()
     {
         var observation = CreateValidObservation();
@@ -201,7 +215,8 @@ public sealed class VexObservationAdapterTests
             _adapter.Convert(observation, _subjectNodeId, null!));
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_EachRecordHasUniqueEvidenceId()
     {
         var statements = ImmutableArray.Create(
@@ -216,7 +231,8 @@ public sealed class VexObservationAdapterTests
         Assert.Equal(evidenceIds.Count, evidenceIds.Distinct().Count());
     }
 
-    [Fact]
+    [Trait("Category", TestCategories.Unit)]
+        [Fact]
     public void Convert_RecordsHavePayloadSchemaVersion()
     {
         var observation = CreateValidObservation();