`just molecule` leaves a shared virtualenv of over 500 MB under var/, plus a
~7 MB Ansible home per role that has a scenario. Neither is reclaimed by
anything today.

`--idle-days N` limits it to what has not been touched recently, so it can be
run unattended without taking the cache out from under a scenario being worked
on right now.

The two directories are named explicitly rather than globbed: var/ holds other
things and must never be removed wholesale.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SEH3vxYSQ5SV4N5z61eyGT