semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/oci-referrer-based-artifact-association.md

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+# OCI Referrer-Based Artifact Association
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+OCI referrer-based attachment of SBOMs, attestations, and verdicts to image digests using the OCI referrers API, with discovery, publishing, and fallback mechanisms.
+
+## Implementation Details
+- **OCI Registry Client**: `src/Cli/StellaOps.Cli/Services/OciRegistryClient.cs` / `IOciRegistryClient.cs` -- OCI registry operations including referrers API
+- **OCI Attestation Registry**: `src/Cli/StellaOps.Cli/Services/OciAttestationRegistryClient.cs` -- attestation-specific OCI operations
+- **Commands**:
+  - `stella oci-list <digest>` -- list OCI referrers for an image digest
+  - `stella oci-verify <digest>` -- verify OCI-attached attestations
+- **Architecture**: Uses OCI referrers API (fallback to tag-based discovery for older registries)
+
+## E2E Test Plan
+- [ ] Run `stella oci-list sha256:abc123` and verify referrers listed (SBOMs, attestations, verdicts)
+- [ ] Run `stella oci-verify sha256:abc123` and verify attached attestation verification
+- [ ] Verify fallback to tag-based discovery when referrers API unavailable
+- [ ] Verify SBOM attachment discovery and content retrieval
+- [ ] Verify `--format json` output