Stage-based port of silo-plugin-audiobooks' abs/ + abssocket/
packages. Preserves the plugin's file layout but rewrites every SQL
query against silo's existing tables (media_items, media_files,
episodes, user_watch_progress, user_playback_sessions, abs_sessions,
people, item_people) — no new tables. Out-of-scope plugin features
(bookmarks, smart collections, share links, playlists, podcasts/RSS
in this sub-plan) are dropped. 8 stages from support files through
Socket.io, router wiring, and final smoke.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
