stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Artifact.Infrastructure/S3UnifiedArtifactStore.Metadata.cs

@@ -0,0 +1,41 @@
+// -----------------------------------------------------------------------------
+// S3UnifiedArtifactStore.Metadata.cs
+// Sprint: SPRINT_20260118_017_Evidence_artifact_store_unification
+// Task: AS-002 - Implement S3-backed ArtifactStore
+// Description: Metadata projection helpers for artifact store
+// -----------------------------------------------------------------------------
+using StellaOps.Artifact.Core;
+
+namespace StellaOps.Artifact.Infrastructure;
+
+public sealed partial class S3UnifiedArtifactStore
+{
+    /// <inheritdoc />
+    public async Task<ArtifactMetadata?> GetMetadataAsync(
+        string bomRef,
+        string serialNumber,
+        string artifactId,
+        CancellationToken ct = default)
+    {
+        var entry = await _indexRepository.GetAsync(bomRef, serialNumber, artifactId, ct)
+            .ConfigureAwait(false);
+        return entry == null ? null : CreateMetadata(entry);
+    }
+
+    private static ArtifactMetadata CreateMetadata(ArtifactIndexEntry entry)
+    {
+        return new ArtifactMetadata
+        {
+            StorageKey = entry.StorageKey,
+            BomRef = entry.BomRef,
+            SerialNumber = entry.SerialNumber,
+            ArtifactId = entry.ArtifactId,
+            ContentType = entry.ContentType,
+            SizeBytes = entry.SizeBytes,
+            Sha256 = entry.Sha256,
+            CreatedAt = entry.CreatedAt,
+            Type = entry.Type,
+            TenantId = entry.TenantId
+        };
+    }
+}