It seems update .0.7 has made the commandRegistry internal.
Another minor-ish annoyance - Unity.Pipeline.asmdef is now constrained behind UNITY_EDITOR || DEVELOPMENT_BUILD || ENABLE_RUNTIME_PIPELINE - that includes all the CliCommandAttribute and CliArgAttribute. So any custom commands fail to compile unless behind the same directives. I see the CodeReloadAttributes moved into a separate assembly so they will compile just essentially as no-ops. I feel like the command and arg attributes should also be there? So user code may continue to compile, but is essentially inert when the pipeline isn't compiled.