Live-test bug: Spotify-flow downloads with Torrent Only as the
active source produced 'download_failed' for every track. Searches
hit Prowlarr fine but no candidate ever got picked. Root cause was
in core/downloads/validation.py's get_valid_candidates:
- The streaming-source allowlist for the structured-metadata path
didn't include 'torrent' / 'usenet', so torrent results fell into
the Soulseek matching branch.
- Soulseek matching parses ``candidate.filename`` as a slskd-style
``Artist/Album/Track.flac`` path. Torrent / usenet filenames are
encoded as ``<download_url>||<display_name>`` so the orchestrator
can recover the URL — splitting that string on slashes produced
garbage path segments that never matched the expected artist,
every candidate failed the artist-folder gate, returned [], track
status flipped to 'not_found'.
Fixes:
- _streaming_sources now includes 'torrent' and 'usenet'. They take
the structured-metadata scoring path that reads r.title / r.artist
directly (the projection layer pre-fills both correctly).
- Artist gate skipped for torrent/usenet, same as YouTube. Album-
level releases legitimately don't expose per-track artist — the
projection falls back to the indexer name as the 'artist' field,
which would otherwise fail the gate against every Spotify artist.
- New album-name fallback scoring: for torrent/usenet only, the
candidate title is ALSO scored against the wanted track's
spotify_track.album field, and the max of (track-title score,
album-title score) wins. This makes a candidate titled
"GNX (2024) [FLAC]" match every track on the GNX album rather
than scoring near zero against a specific track title like
"Luther (with SZA)". match_type 'album_release' for visibility.
All 9 existing validation tests still pass.
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