A Soulseek album bundle stages whichever single folder scored best. If that
folder doesn't contain every track the album needs, the missing tracks were
marked not_found with no fallback — even in hybrid mode where later sources
(Deezer, YouTube, etc.) could fill them. The staging-miss short-circuit fired
for Soulseek because 'soulseek' was lumped into the torrent/usenet source set
when album bundles were added, and album_bundle_partial only reflects whether
the files found IN the folder downloaded, not whether the folder had every
needed track.
Drop 'soulseek' from the short-circuit (keep torrent/usenet). A track not
claimed from the staged Soulseek folder now falls through to the normal
per-track Soulseek search and, in hybrid mode, onward down the configured
chain. Unlike torrent/usenet — where per-track search re-adds the same
release — Soulseek per-track search is a genuine per-file network search, so
this is correct and cheap. Realizes the original author's stated intent
('keep partial bundles from blocking per-track fallback') robustly, since the
partial flag couldn't detect a folder that was simply missing tracks.
Only affects tracks NOT claimed from staging — fully-staged albums claim every
track via try_staging_match and never reach this gate, so working albums are
unchanged. Likely also mitigates #755 (all-album-import failures now fall
through to per-track instead of dying).
Tests: rewrote the two Soulseek staged-miss tests to assert fall-through
(single + hybrid-first); kept the torrent guard; added a usenet guard test.
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