## Summary
When the OCI validator's anonymous manifest fetch returns HTTP 429,
return a retryable error instead of `nil`. This aligns OCI with the
fail-closed behavior of the npm / PyPI / NuGet / MCPB validators, and
ensures the `io.modelcontextprotocol.server.name` label-match always
runs before a publish is accepted.
## Test plan
- [x] `go test ./internal/validators/registries/ -run TestValidateOCI`
passes locally
- [x] `gofmt` + `golangci-lint` clean on the changed file
- [ ] CI green
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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