ObserveManager.apply() shallow-merges every incoming rep onto whatever's
already cached for that href (issue #27's fix for /mode/vs/0's partial
notifies). That assumes an absent key always means "unchanged, keep the
old value" -- true for /mode/vs/0's supportedOptions, but backwards for
/alarms/vs/0: entity.py already documents {} as this resource's
canonical no-alarm state, and a live read_resource GET on the reporter's
washer confirmed the board sends exactly that {} when an alarm clears.
Merging it onto the prior rep left the stale ErrorCode_DC entry in the
cache forever, surviving power cycles and only clearing on a full
integration reload (which rebuilds the cache from scratch instead of
merging).
Add _is_alarms_href() to recognize /alarms/vs/<index> across every
subdevice-translated shape (MAIN identity, indexed renumbering, prefixed
UUID -- Subdevice.to_actual never touches the 'alarms/vs' stem) and have
apply() fully replace the cache for that href instead of merging. This
is a global fix: every family with an alarm sensor shares this href
(common.ALARMS, range_hood's own copy), so they were all exposed.
Marc Billow
cd3a47f9a4