Add tests for SBOM generation determinism across multiple formats

- Created `StellaOps.TestKit.Tests` project for unit tests related to determinism.
- Implemented `DeterminismManifestTests` to validate deterministic output for canonical bytes and strings, file read/write operations, and error handling for invalid schema versions.
- Added `SbomDeterminismTests` to ensure identical inputs produce consistent SBOMs across SPDX 3.0.1 and CycloneDX 1.6/1.7 formats, including parallel execution tests.
- Updated project references in `StellaOps.Integration.Determinism` to include the new determinism testing library.

src/Concelier/__Tests/StellaOps.Concelier.Connector.Ghsa.Tests/Ghsa/GhsaConnectorTests.cs

@@ -157,6 +157,42 @@ public sealed class GhsaConnectorTests : IAsyncLifetime
         Assert.Empty(pendingMappings.AsDocumentArray);
     }
 
+    [Fact]
+    public async Task FetchAsync_ResumesFromPersistedCursorWindow()
+    {
+        var initialTime = new DateTimeOffset(2024, 10, 7, 0, 0, 0, TimeSpan.Zero);
+        await EnsureHarnessAsync(initialTime);
+        var harness = _harness!;
+
+        var since = initialTime - TimeSpan.FromDays(8);
+        var until = initialTime - TimeSpan.FromDays(7);
+
+        var stateRepository = harness.ServiceProvider.GetRequiredService<ISourceStateRepository>();
+        await stateRepository.UpdateCursorAsync(
+            GhsaConnectorPlugin.SourceName,
+            new DocumentObject
+            {
+                ["currentWindowStart"] = since.UtcDateTime,
+                ["currentWindowEnd"] = until.UtcDateTime,
+                ["nextPage"] = 2,
+                ["pendingDocuments"] = new DocumentArray(),
+                ["pendingMappings"] = new DocumentArray(),
+            },
+            initialTime,
+            CancellationToken.None);
+
+        var listUri = new Uri($"https://ghsa.test/security/advisories?updated_since={Uri.EscapeDataString(since.ToString("O"))}&updated_until={Uri.EscapeDataString(until.ToString("O"))}&page=2&per_page=5");
+        harness.Handler.AddJsonResponse(listUri, """{"advisories":[],"pagination":{"page":2,"has_next_page":false}}""");
+        harness.Handler.SetFallback(_ => new HttpResponseMessage(HttpStatusCode.NotFound));
+
+        var connector = new GhsaConnectorPlugin().Create(harness.ServiceProvider);
+        await connector.FetchAsync(harness.ServiceProvider, CancellationToken.None);
+
+        var request = Assert.Single(harness.Handler.Requests);
+        Assert.Equal(listUri, request.Uri);
+        harness.Handler.AssertNoPendingResponses();
+    }
+
     private async Task EnsureHarnessAsync(DateTimeOffset initialTime)
     {
         if (_harness is not null)