Restructure solution layout by module

src/Scanner/StellaOps.Scanner.Sbomer.BuildXPlugin/Descriptor/DescriptorArtifact.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace StellaOps.Scanner.Sbomer.BuildXPlugin.Descriptor;
+
+/// <summary>
+/// Represents an OCI artifact descriptor emitted by the BuildX generator.
+/// </summary>
+public sealed record DescriptorArtifact(
+    [property: JsonPropertyName("mediaType")] string MediaType,
+    [property: JsonPropertyName("digest")] string Digest,
+    [property: JsonPropertyName("size")] long Size,
+    [property: JsonPropertyName("annotations")] IReadOnlyDictionary<string, string> Annotations);