- Add retrievePaymentIntent() to StripeService
- StripeSyncCommand now checks pending orders against Stripe API:
- succeeded: generates tickets, sends emails, notifies organizer
- canceled: marks order as cancelled + audit log
- requires_payment_method: marks as cancelled + audit + failure email
- other statuses: logs as still pending
- Add 13 tests covering accounts sync + all pending order scenarios
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>