10db6c5b84
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Replace unbounded goroutine-per-delivery fan-out with a fixed-size worker pool (10 workers). Channels serve as bounded queues (10,000 buffer). Workers are the only goroutines doing HTTP delivery. When retry channel overflows, timers are dropped instead of re-armed. The delivery stays in 'retrying' status in the DB and a periodic sweep (every 60s) recovers orphaned retries. The database is the durable fallback — same path used on startup recovery. Addresses owner feedback on circuit breaker recovery goroutine flood.