feat: Add Exponential Backoff With Jitter on Retry - #17
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Nack and handler throw wait min(cap, base * 2^(attempt-1)) before redelivery, with full/equal/decorrelated jitter so retries do not align. A delayed retry list keeps other ready work moving.
Omitted retryBackoff now has a nack-and-wait test so the constructor default cannot flip silently. README usage nacks, advances ManualClock, then shows redelivery. Decorrelated lastDelayMs is spelled out and covered at the queue.
ThomasHartDev
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Work-queue nack used to requeue immediately, and the pump could hand the same payload back in the same tick. That is a retry storm: every failing consumer wakes together and hammers a dependency that is already unhappy.
A nack or handler throw now waits before redelivery. For none, full, and equal jitter the wait is min(cap, base * 2^(attempt-1)), then jitter (full by default). Decorrelated ignores attempt and walks lastDelayMs: the next delay is drawn between base and min(cap, last * 3). Other ready work still goes out while a retry sits on the delayed list. Pass retryBackoff: false when you want the old immediate requeue. Tests drive this with ManualClock so we do not sleep.
The package barrel also re-exports DeadLetterQueue so existing tests that import those names from src/index keep typechecking.
Closes #16.