- Add /v2/ endpoint implementing OCI Distribution API for native docker pull support
- Add docker_auth.py with Bearer token challenge handling and in-memory token cache
- Classify tag-based manifests (/manifests/<tag>) as index (short TTL, mutable)
- Classify digest-pinned manifests (/manifests/sha256:...) and blobs as file cache (indefinite, immutable)
- Deduplicate blob storage by keying on sha256 digest rather than image path
- Support username/password auth per docker remote in remotes.yaml