feat: Add MongoIdempotencyStoreOptions for MongoDB configuration

feat: Implement BsonJsonConverter for converting BsonDocument and BsonArray to JSON

fix: Update project file to include MongoDB.Bson package

test: Add GraphOverlayExporterTests to validate NDJSON export functionality

refactor: Refactor Program.cs in Attestation Tool for improved argument parsing and error handling

docs: Update README for stella-forensic-verify with usage instructions and exit codes

feat: Enhance HmacVerifier with clock skew and not-after checks

feat: Add MerkleRootVerifier and ChainOfCustodyVerifier for additional verification methods

fix: Update DenoRuntimeShim to correctly handle file paths

feat: Introduce ComposerAutoloadData and related parsing in ComposerLockReader

test: Add tests for Deno runtime execution and verification

test: Enhance PHP package tests to include autoload data verification

test: Add unit tests for HmacVerifier and verification logic

tests/Provenance/StellaOps.Provenance.Attestation.Tests/TestTimeProvider.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace StellaOps.Provenance.Attestation.Tests;
+
+internal sealed class TestTimeProvider : TimeProvider
+{
+    private DateTimeOffset _now;
+
+    public TestTimeProvider(DateTimeOffset now) => _now = now;
+
+    public override DateTimeOffset GetUtcNow() => _now;
+    public override TimeZoneInfo LocalTimeZone => TimeZoneInfo.Utc;
+    public override long GetTimestamp() => 0L;
+
+    public void Advance(TimeSpan delta) => _now = _now.Add(delta);
+}