The rebase onto merged #79, with the reconciliation both PRs' bodies
promised: the installer's and the #66 refusals' "copy out by hand (a
portable 'box export' is #70)" placeholders now name the real flow —
down, export (one portable file per box), rm, switch, import. CI keeps
main's versioned layout and uninstall drill, with the #70 round-trip
step ordered before the uninstall (it needs a stack to prove state
survives 'box rm').
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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