Re-deliver a message's lifecycle webhook to all endpoints
Re-dispatches the message’s current-state lifecycle webhook (message.created / message.sent / message.delivered / message.failed / message.read, mapped from the persisted status) to every active subscribed endpoint, reusing the live send pipeline’s signing + retry path. Returns 202 with the resolved event type and the number of endpoints the replay was enqueued against (0 when no active endpoint subscribes). The deliveries land asynchronously and surface in the message-detail Webhook Fan-out card. Distinct from the webhook-endpoint-scoped POST /webhooks//deliveries//replay, which re-fires a single stored delivery to one endpoint.