@spec acknowledge(
  ArchAstro.SDK.Client.t(),
  String.t(),
  ArchAstro.SDK.Types.Operations.PostApiV1EventSubscriptionDeliveriesDeliveryAcknowledge.Input.t()
) :: {:ok, :ok} | {:error, ArchAstro.SDK.Error.reason()}

Acknowledge a claimed event

Acknowledges a delivery using its current receipt handle. Repeating the same acknowledgement is idempotent; a stale or incorrect receipt returns 409. Acknowledging a delivery that aged out under the subscription's retention returns delivery_not_found — the event was already counted in dropped_events_total, and the acknowledgement should not be retried.

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