pacman-conf proved the shipped pacman.conf through its Include of
/etc/pacman.d/mirrorlist, which the shut-off unit level does not have: the
proven file now reads a mirror list of its own, and a guard test holds that
every repository of the shipped file includes the list reflector writes.
ssh-client's Test case for a run without an agent read the account's
SSH_AUTH_SOCK, so it failed on any desk with an agent: it now sets its own,
and also proves the environment's agent is the one reported.