- New service module createPendingConfirmation: writes a PENDING
FinalistConfirmation row with a signed token whose exp matches the
computed deadline.
- selectFinalists admin mutation: reads windowHours from the round's
configJson.confirmationWindowHours (default 24), validates category
match + quota, then creates one confirmation per selected project
and sends a notification email to the team lead. Email failures are
logged but never roll back the row creation.
- New email helpers: getFinalistConfirmationTemplate +
sendFinalistConfirmationEmail.
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