stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Artifact.Infrastructure/InMemoryArtifactIndexRepository.cs

@@ -0,0 +1,24 @@
+// -----------------------------------------------------------------------------
+// InMemoryArtifactIndexRepository.cs
+// Sprint: SPRINT_20260118_017_Evidence_artifact_store_unification
+// Task: AS-003 - Create ArtifactStore PostgreSQL index
+// Description: In-memory artifact index repository for testing
+// -----------------------------------------------------------------------------
+using StellaOps.Artifact.Core;
+
+namespace StellaOps.Artifact.Infrastructure;
+
+/// <summary>
+/// In-memory implementation for testing.
+/// </summary>
+public sealed partial class InMemoryArtifactIndexRepository : IArtifactIndexRepository
+{
+    private readonly List<ArtifactIndexEntry> _entries = new();
+    private readonly object _lock = new();
+    private readonly TimeProvider _timeProvider;
+
+    public InMemoryArtifactIndexRepository(TimeProvider? timeProvider = null)
+    {
+        _timeProvider = timeProvider ?? TimeProvider.System;
+    }
+}