An absent artwork state was revisited by an hourly job, by viewing the entity, and
by the startup backfill on any artwork config change. On a large library the last
one queued tens of thousands of external lookups at once and got the provider to
rate-limit us for hours.
Nothing revisits an absent state now. Retrying is explicit: `artwork reprocess` on
the CLI, or the refresh button in the UI. The config fingerprint survives only as an
advisory, warning at startup and naming the command that clears it.
Since absent is terminal, `artwork status` splits it into two disjoint columns, and
`--source failed` targets only the ones that gave up rather than being answered.
Both read through the filter CountBySource and EnqueueBySource already share, so the
reported number is the set the command acts on.
Also fixes the last_failure default left by 20260819204637, which marked every
pre-existing absent row as failed, and removes the code the deleted retry paths
orphaned.
47bc3c00f3