feat: add WithRetry middleware with ConstantBackoff and ExponentialBa…#15
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…ckoff WithRetry(n, backoff) re-invokes a handler up to n times on error (total attempts = n+1). Stops early on success, respects context cancellation during backoff sleep, and pairs naturally with the DLQ — after all retries are exhausted the error propagates to execute() and the event is dead-lettered as normal. Backoff helpers: ConstantBackoff(d) always waits d; ExponentialBackoff(base) doubles on each retry (base, 2×base, 4×base, ...). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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…ckoff
WithRetry(n, backoff) re-invokes a handler up to n times on error (total attempts = n+1). Stops early on success, respects context cancellation during backoff sleep, and pairs naturally with the DLQ — after all retries are exhausted the error propagates to execute() and the event is dead-lettered as normal.
Backoff helpers: ConstantBackoff(d) always waits d; ExponentialBackoff(base) doubles on each retry (base, 2×base, 4×base, ...).