Status page NARR progress counted `hrrr_status = :unavailable` as the
candidate set, which swept in ~13.6K post-2014 HRRR retry rows and
showed "0 / 13,652". Candidate eligibility is qso_timestamp-based, not
hrrr_status-based — switch both the numerator and denominator to
`qso_timestamp < NarrClient.coverage_end()` so pre-2014 rows are
counted whether their hrrr_status is :queued, :unavailable, or
:complete.
ContactWeatherEnqueueWorker: short-circuit hrrr_points_for_contact/1
for pre-coverage timestamps and mark the contact :unavailable when no
HRRR jobs are built. Was producing a ping-pong where reconcile flipped
pre-2014 :queued → :unavailable and the same cron run flipped it back
to :queued from a rebuilt HRRR job that could never land data.