Toggle to search all sources and download best→worst by actual audio
quality, vs today's priority-first (first satisfying source wins).
Reuses exhausted_download_sources for per-source budget removal; query
generator and budget counters untouched. Independent of retry_exhaustive.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Design for source-binding + quality-aware fall-through ranking
(per-source population, source-priority-king), ranked-targets UI,
quarantine-reason surfacing, and tests. Locks the constraints that
quality quarantine reuses the trigger='quality' retry path and never
sets force_imported (reserved for AcoustID mismatches).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>