Deluan 9c516cf601 refactor(plugins): serialize PlaylistGenerator plugin calls via work queue
Replace the timer-per-playlist + WaitGroup.Go model with a single worker
goroutine processing work items from a buffered channel. This eliminates
race conditions from parallel plugin calls (rate limiting risk),
unsynchronized map/field access across goroutines, and overlapping
discovery and refresh timers. The worker owns all mutable state
(refreshTimers, discoveryTimer) exclusively, while retryInterval and
refreshTimerCount use atomics for safe test observability. Also adds
retry-on-failure for GetAvailablePlaylists (5 min delay) and makes
MockPlaylistRepo thread-safe with sync.RWMutex.
2026-04-12 17:32:18 -04:00
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