isothrum 2.1.6

Fixed

• A Compose run's retire and detach remove the machine's anonymous volumes. The removal of a
  machine taken out of the running run (compose rm -sf) and of a leftover container
  (docker rm -f) left the anonymous volumes of the container's image behind: the attack box's
  two, at every retire (the Cyber CTF rig's leftover audit, 2026-11-13, after 2.1.5 had covered
  the stop and the update). Both removals take their volumes (-v), and a retire or detach
  records the project's anonymous volumes before its steps and removes the recorded ones no
  container holds after them, as an update does.