Closes each unsatisfied wanted language per DESIGN.md §8/§15: embedded
tracks satisfy for free (recording them as #189 left to this issue),
then provider search + ranked fetch + alass sync + sidecar write, then
immediate machine translation — extracting a text-format embedded track
when that is the only source — and otherwise the reason lands on the
attempt row for the missing-subtitles queue.
Closes run as detached tasks because alass and translation outlive the
25 s reconcile action budget; every outcome is recorded in domain rows
first, so a crash converges on the next tick. Failures back off on the
same §6.2 curve as movie searches; a rate-limited provider is the
'capped' queue state; unreachable providers and translators fold into
the existing §9.5 broken notification, edge-triggered.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Miguel Palhas
c2ca25895f