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- Split single sync.Mutex into per-map mutexes (activeJobs, stepStates, rateLimiter, pendingInput, cancelFuncs) to reduce contention - Add download semaphore (channel-buffered, 3 concurrent) as worker pool - Add cancelFuncs map with context cancellation wired into download goroutines for clean shutdown - Replace playlist busy-poll (500ms sleep loop) with synchronous runDownload + Done channel for completion tracking - Use full UUID for job IDs instead of 8-char prefix - Download thumbnail URL to temp file before sending (InputFileUpload) - Change MAX_FILE_SIZE_MB default from 2000 to 50 - Clean up cancel funcs after normal download completion