Restructure solution layout by module

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

@@ -0,0 +1,45 @@
+using System;
+
+namespace StellaOps.Scanner.Sbomer.BuildXPlugin.Descriptor;
+
+/// <summary>
+/// Request for generating BuildX descriptor artifacts.
+/// </summary>
+public sealed record DescriptorRequest
+{
+    public string ImageDigest { get; init; } = string.Empty;
+    public string SbomPath { get; init; } = string.Empty;
+    public string SbomMediaType { get; init; } = "application/vnd.cyclonedx+json";
+    public string SbomFormat { get; init; } = "cyclonedx-json";
+    public string SbomArtifactType { get; init; } = "application/vnd.stellaops.sbom.layer+json";
+    public string SbomKind { get; init; } = "inventory";
+    public string SubjectMediaType { get; init; } = "application/vnd.oci.image.manifest.v1+json";
+    public string GeneratorVersion { get; init; } = "0.0.0";
+    public string? GeneratorName { get; init; }
+    public string? LicenseId { get; init; }
+    public string? SbomName { get; init; }
+    public string? Repository { get; init; }
+    public string? BuildRef { get; init; }
+    public string? AttestorUri { get; init; }
+    public string PredicateType { get; init; } = "https://slsa.dev/provenance/v1";
+
+    public DescriptorRequest Validate()
+    {
+        if (string.IsNullOrWhiteSpace(ImageDigest))
+        {
+            throw new BuildxPluginException("Image digest is required.");
+        }
+
+        if (!ImageDigest.Contains(':', StringComparison.Ordinal))
+        {
+            throw new BuildxPluginException("Image digest must include the algorithm prefix, e.g. 'sha256:...'.");
+        }
+
+        if (string.IsNullOrWhiteSpace(SbomPath))
+        {
+            throw new BuildxPluginException("SBOM path is required.");
+        }
+
+        return this;
+    }
+}