semi implemented and features implemented save checkpoint

docs/features/unchecked/scanner/oci-image-inspector-service.md

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+# OCI Image Inspector Service (IOciImageInspector)
+
+## Module
+Scanner
+
+## Status
+IMPLEMENTED
+
+## Description
+Service for inspecting OCI images including multi-arch manifest resolution, layer enumeration, platform detection, and digest extraction without pulling full image content.
+
+## Implementation Details
+- **Image Inspector**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/IOciImageInspector.cs` - `IOciImageInspector` interface for inspecting OCI images without pulling full content
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/OciImageInspector.cs` - `OciImageInspector` implementation supporting multi-arch manifest resolution, layer enumeration, platform detection, and digest extraction
+- **Inspection Models**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Contracts/OciInspectionModels.cs` - `OciInspectionModels` defining inspection result types (layers, platforms, digests)
+- **DI Registration**: `src/Scanner/__Libraries/StellaOps.Scanner.Storage.Oci/ServiceCollectionExtensions.cs`
+
+## E2E Test Plan
+- [ ] Inspect a single-arch OCI image and verify layer enumeration returns correct layer digests and sizes
+- [ ] Inspect a multi-arch OCI image and verify platform detection identifies all available architectures (amd64, arm64, etc.)
+- [ ] Verify multi-arch manifest resolution selects the correct platform-specific manifest based on the runtime platform
+- [ ] Verify digest extraction returns the correct content-addressable digest for the image manifest
+- [ ] Verify inspection works without pulling full image content (manifest-only operation)
+- [ ] Verify inspection handles private registries with authentication