usage: tautline maintainer-mode [-h] {on,off,status}

Maintainer mode: update gates stand down machine-wide while armed -- no fetch,
no branch check, no rescue, no repair escalation at launch; a loud banner
prints on every armed launch and heal keeps republishing the canonical
checkout's HEAD. `on` writes the mode key into the installed config env file
(the ONLY arming state: a live-environment value is inert by design), `off`
strips it from every config surface and is therefore authoritative, `status`
prints the three-state maintainer_mode line that methodology-status also
reports.

positional arguments:
  {on,off,status}  on: arm the standdown; off: disarm and restore stock
                   behavior; status: report.

options:
  -h, --help       show this help message and exit
