One-shot, idempotent helper that prepares an existing (Chef) node for Cinc Workstation management: installs Cinc Client, points /etc/cinc at the existing /etc/chef config, drops the deprecated attribute lists, and pre-seeds the allowed_* attribute lists so the first converge does not filter node attributes (e.g. vm_host). The node can then be converged as usual. Verified against drone-1.