mentor.autoAssignBulkForRound now skips any project whose finalist
confirmation isn't CONFIRMED — there's no point assigning a mentor to
a team that won't be at the grand finale. Other eligibility rules
(wantsMentorship, admin_selected, already-assigned) are preserved.
Updated existing requested_only and skip-already-assigned tests to seed
CONFIRMED confirmations so they continue to isolate their target gate.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>