- The standalone enricher now reports orb telemetry: stats()/pause()/resume();
/enrichment/youtube/status (+pause/resume) special-cased in the route. Added
the 4th header worker button (red ▶), WORKER_DEFS entry, and SERVICES wiring —
it's not on the socket so video-enrichment.js polls it every 3s. It animates
(idle → active orb + inbound pulses) while a followed channel's dates are being
fetched, like the TMDB/TVDB/OMDb orbs.
- Channel detail now uses the SAME standard watchlist button as shows/movies
(library-artist-watchlist-btn, ✓/＋ icon, 'In Watchlist'/'Watchlist') instead
of a bespoke 'Follow' — consistency. Still wired to the channel follow action.
176 backend tests green; JS balanced; music untouched.
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