Merge all changes

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

@@ -38,7 +38,7 @@ public class InMemoryEvidenceStoreTests
         var result = await _store.StoreAsync(evidence);
 
         Assert.Equal(evidence.EvidenceId, result);
-        Assert.Equal(1, _store.Count);
+        Assert.Single(_store);
     }
 
     [Trait("Category", TestCategories.Unit)]
@@ -50,7 +50,7 @@ public class InMemoryEvidenceStoreTests
         await _store.StoreAsync(evidence);
         await _store.StoreAsync(evidence);
 
-        Assert.Equal(1, _store.Count);
+        Assert.Single(_store);
     }
 
     [Trait("Category", TestCategories.Unit)]
@@ -99,7 +99,7 @@ public class InMemoryEvidenceStoreTests
         var count = await _store.StoreBatchAsync([]);
 
         Assert.Equal(0, count);
-        Assert.Equal(0, _store.Count);
+        Assert.Empty(_store);
     }
 
     #endregion
@@ -283,7 +283,7 @@ public class InMemoryEvidenceStoreTests
         var deleted = await _store.DeleteAsync(evidence.EvidenceId);
 
         Assert.True(deleted);
-        Assert.Equal(0, _store.Count);
+        Assert.Empty(_store);
     }
 
     [Trait("Category", TestCategories.Unit)]
@@ -348,7 +348,7 @@ public class InMemoryEvidenceStoreTests
 
         _store.Clear();
 
-        Assert.Equal(0, _store.Count);
+        Assert.Empty(_store);
     }
 
     #endregion

src/__Libraries/StellaOps.Replay.Core.Tests/FeedSnapshot/FeedSnapshotCoordinatorTests.cs

@@ -139,6 +139,7 @@ public sealed class FeedSnapshotCoordinatorTests
         var result = await coordinator.ValidateSnapshotAsync(snapshot.CompositeDigest);
 
         // Assert
+        Assert.NotNull(result);
         Assert.True(result.IsValid);
         Assert.Null(result.MissingSources);
         Assert.Null(result.DriftedSources);

src/__Libraries/StellaOps.Resolver.Tests/CycleDetectionTests.cs

@@ -114,7 +114,7 @@ public class CycleDetectionTests
         var result = validator.Validate(graph);
 
         Assert.False(result.IsValid);
-        Assert.Single(result.Errors.Where(e => e.Contains("Cycle detected")));
+        Assert.Single(result.Errors, e => e.Contains("Cycle detected"));
     }
 
     [Trait("Category", TestCategories.Unit)]

src/__Libraries/__Tests/StellaOps.Signals.Tests/CallgraphIngestionTests.cs

@@ -55,7 +55,7 @@ public class CallgraphIngestionTests : IClassFixture<SignalsTestFactory>
         Assert.Equal(component, doc.Component);
         Assert.Equal("1.0.0", doc.Version);
         Assert.Equal(2, doc.Nodes.Count);
-        Assert.Equal(1, doc.Edges.Count);
+        Assert.Single(doc.Edges);
 
         var artifactPath = Path.Combine(factory.StoragePath, body.ArtifactPath);
         Assert.True(File.Exists(artifactPath));