feat(events): on-chain crypto refund flow on event cancellation - #108
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Wire up the refund processing deferred in cancelEvent. Cancelling a PUBLISHED event with sold tickets now fans out one on-chain claimRefund per confirmed, minted crypto (USDC) ticket, signed by the buyer's Circle wallet (the contract gates on token ownership). Fiat tickets can't be refunded on-chain (claimRefund reverts FiatTicketNotRefundable) and are logged as needing off-chain handling. - schema: BlockchainTxType.REFUND + Ticket.refundedAt/refundTxHash - RefundQueueService: producer mirroring the mint queue (5 attempts, exp backoff, eager BlockchainTransaction audit row) - RefundProcessor: claimRefund via buyer wallet, webhook-or-poll completion, terminal-vs-retryable revert classification (RefundPeriodExpired/NotEnabled/etc → UnrecoverableError) - RefundFinalizerService: idempotent REFUNDED flip + soldCount release - circle-webhook.processor: route confirmed REFUND txs to finalizer - cancelEvent: enqueue refunds for crypto tickets Tests: refund.processor (7) + events.cancel (3); suite green.
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Wire up the refund processing deferred in cancelEvent. Cancelling a PUBLISHED event with sold tickets now fans out one on-chain claimRefund per confirmed, minted crypto (USDC) ticket, signed by the buyer's Circle wallet (the contract gates on token ownership). Fiat tickets can't be refunded on-chain (claimRefund reverts FiatTicketNotRefundable) and are logged as needing off-chain handling.
Tests: refund.processor (7) + events.cancel (3); suite green.