Run 14's second catch: the blank mint's cloud-init finished, printed
'status: done' — and 'box new' hung for 15+ minutes on an exec session
that never closed ('incus operation list' showed it still RUNNING).
With a TTY on stdin (the drill redirects only stdout/stderr), incus
exec goes interactive, and the session can wedge open after the remote
command has exited. Same disease as drill trap 2 and doctor trap 13;
the CLI's own execs never got the cure.
Every non-interactive exec now pins stdin: wait_agent's probe, the
cloud-init wait, both failure-path reads, and the clone identity
reset. shell/exec/tmux keep the terminal — owning it is their job.
Also: wipe.sh keeps cached images on a plain wipe. An image is
upstream's artifact, content-addressed by fingerprint — deleting it
buys zero cleanliness and costs the next mint a full re-download. It
goes only with --purge-storage, where the pool it lives in goes too
(and it must go first: images block pool deletion).
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