feat: add dead letter queue with panic recovery#14
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Failed and panicking handlers are routed to an opt-in DeadLetterQueue (store.DLQ = GoEventBus.NewDeadLetterQueue()) instead of being silently counted in errorCount. Panics are wrapped as errors with errors.Is/As support and do not kill worker goroutines or the calling goroutine. New API: DeadLetter struct, DeadLetterQueue with Len/Entries/Drain/Replay. Replay re-subscribes all entries, increments Attempts, and keeps entries that fail to re-enqueue. Recovery moved from worker() into execute() so sync-mode panics are also caught. README updated with full DLQ section. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Failed and panicking handlers are routed to an opt-in DeadLetterQueue (store.DLQ = GoEventBus.NewDeadLetterQueue()) instead of being silently counted in errorCount. Panics are wrapped as errors with errors.Is/As support and do not kill worker goroutines or the calling goroutine.
New API: DeadLetter struct, DeadLetterQueue with Len/Entries/Drain/Replay. Replay re-subscribes all entries, increments Attempts, and keeps entries that fail to re-enqueue. Recovery moved from worker() into execute() so sync-mode panics are also caught. README updated with full DLQ section.