Add sendDueConfirmationReminders() to finalist-confirmation.ts: queries
PENDING confirmations with no reminderSentAt whose deadline is within the
per-program LIVE_FINAL round reminderHoursBeforeDeadline window (default 12h),
sends a FINALIST_REMINDER in-app notification (+ email via pipeline) to the
team LEAD, then stamps reminderSentAt for idempotency.
Wire into the finalist-confirmations cron route alongside expirePendingPastDeadline.
Also clear reminderSentAt on re-invite in resetOrCreatePendingConfirmation so
re-invited teams get a fresh reminder window.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
