Standalone reference for the mobile team: auth, streaming (/stream +
X-Audio-Duration), the synced library index (manifest/meta/cover + per-album v
diffing, ETag/304), building/refreshing (reindex + SSE progress), the
recommended resync algorithm, and the data shapes (IndexMeta/Manifest/
IndexStatus/IndexReport).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
