apex-callout-retry-and-resilience

Strategy layer for resilient Apex HTTP callouts: bounded retry with backoff, queueable async retry chains, circuit-breaker via Platform Cache, idempotency keys, dead-letter pattern. NOT for callout authentication — see apex-named-credentials-patterns. NOT for transaction-boundary rules — see callout-and-dml-transaction-boundaries. NOT a re-write of the Http…

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