- finalist.getByToken: public lookup of a confirmation by signed token,
with all the data the public page needs (project, team members, current
state). Throws on expired/tampered tokens.
- finalist.confirm: validates team membership of every selected user,
checks against program.defaultAttendeeCap, atomically writes
status=CONFIRMED + AttendingMember rows in a transaction.
- finalist.decline: captures optional reason, then promotes the next
WAITING waitlist entry in the same category (no-op if waitlist empty).
Resolves the new windowHours from the LIVE_FINAL round configJson.
- promoteNextWaitlistEntry service: encapsulates the cascade (mark
PROMOTED, create fresh PENDING confirmation, send email).
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