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API: - isCached(trackId), pathFor(trackId) - pin(trackId, source) — dio.download → drift index entry - unpin(trackId), clearAll() - usageBytes(), evict(targetBytes) Eviction order: incidental → autoPrefetch → autoPlaylist → autoLiked. 'manual' never evicts via cap-driven eviction; only clearAll() removes operator-pinned tracks. Two providers: - appDbProvider — singleton AppDb per run - audioCacheManagerProvider — wraps the AppDb + dioProvider Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>