The ranked-target list is now the single source of truth for which formats
download, in the user's exact priority order, for ALL sources — no hardcoded
format hierarchy decides anything. A candidate passes only if it matches a
ranked target; if nothing matches, the existing Use-Fallback toggle decides.
- source_map: new shared format_from_extension() + AUDIO_EXTENSIONS — one
source of truth for extension→format used by every extension-based source, so
adding a format lights it up everywhere. Soulseek now classifies through it
(opus/wav/aiff were previously dropped as 'unknown').
- file_ops.probe_audio_quality (generic import-time guard, all sources): add
WMA; detect ALAC from the real codec (an .m4a is AAC or ALAC).
- soulseek: drop the AAC-specific opt-in gate — AAC now follows the same
universal rule as every format.
- model.tier_score: documented as ONLY a same-format tiebreak + fallback order,
never cross-format priority (the list owns that); add opus/alac bases.
- UI: ranked-target editor offers all formats (FLAC/ALAC/WAV·AIFF lossless with
bit-depth+sample-rate; MP3/AAC/OGG/Opus/WMA lossy with min-bitrate).
- tests: AAC retargeted to the universal model; new coverage for
format_from_extension and matches_target across all formats.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
radoslav-orlov: add AAC as a download quality option. AAC is more efficient than
MP3, so it's useful for Soulseek/torrents (streaming sources pick their own
codec; Amazon — the AAC-heavy one — is down).
Additive by construction: every quality tier already defaults enabled=false and
the waterfall is built only from enabled tiers, so AAC ships OFF and the bucketer
routes a not-enabled AAC file to the 'other' bucket EXACTLY as today (where it was
silently dropped). Only a user who turns AAC on makes it a first-class tier,
ranked above MP3 / below FLAC (priority 1.5, min-kbps gate so junk AAC can't beat
a good MP3).
- music_database: aac tier (disabled) in the default profile + all 3 presets.
- soulseek_client: map .m4a -> 'aac' in both result parsers (was 'unknown' ->
dropped); add the 'aac' bucket + a gated branch + a fallback size limit.
- settings UI: an 'AAC' tier toggle (unchecked) between FLAC and MP3; save
defaults its priority to 1.5 so upgraded profiles rank it right on first save.
7 seam tests pinning the additive guarantee (aac absent/disabled -> dropped as
before; FLAC/MP3 selection unchanged; aac on -> selectable, below FLAC, above
MP3); 81 quality/soulseek tests pass, ruff clean. quality_upgrade left untouched
(its AAC handling is unchanged).
