`core/media_server/` package with the Protocol contract that every media server client (Plex, Jellyfin, Navidrome, SoulSync standalone) satisfies, plus the registry that holds them. Required methods conservatively limited to the four every server truly implements today: is_connected, ensure_connection, get_all_artists, get_all_album_ids. Other generic methods (search_tracks, trigger_library_scan, get_recently_added_albums, etc.) are listed as OPTIONAL — present on most servers but not all (SoulSync has no library-scan API since it walks the filesystem directly; Jellyfin uses a different search shape). Phase B's engine adapters route around the gaps with per-server fallback instead of forcing every client to declare a no-op stub. Same registry shape as the download plugin registry — single source of truth for which servers exist + name resolution. Adding a 5th server (Subsonic, Emby, etc.) becomes one register call plus the new client class. 5 conformance tests pin every server class implements every required method. Plan doc at docs/media-server-engine-refactor-plan.md. Pure additive — no consumer routes through the contract or registry yet. Suite still green (1921 passed).
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Python
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Python