Manual testers kept asking which parts of docs/TESTING.md the public stand
can actually exercise. The answer used to live in nobody's head: the stand
was missing a vacuum, any LQI at all, toggleable leak/smoke alarms, an
hvac_action marker, and its automations/scripts/scenes YAML was never
!included - so the tap-run marker pointed at a script that did not exist.
With those gaps closed on the stand, this doc maps each checklist item to a
concrete click path on demo.houseplan.tech, and openly lists what only
local setups or real hardware can verify (broken stores, HACS flows,
non-admin users, anything that must outlive the hourly reset).
