feat: Add Per-Key Ordering Guarantees - #15
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KeyedWorkQueue keeps FIFO order within a message key and lets different keys run in parallel on competing consumers.
ThomasHartDev
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WorkQueue round-robins messages independently, so two events for the same order can be in flight on different consumers and finish out of order. KeyedWorkQueue is the SQS FIFO / Kafka key model: at most one in-flight delivery per key, later messages of that key wait, and other keys can still run in parallel.
Nack puts the head back at the front of that key so a retry cannot be overtaken. Prefetch can hold several keys, never two messages of one key. The barrel also re-exports DeadLetterQueue so the existing tests typecheck against src/index.
Closes #14