The classification query required status='completed' AND payment_status=
'paid', but the correct flow is: form fee → photo → disciplines → THEN
coach classifies. Players were invisible because they're still
'in_progress' at that point.

Fixed to: form_payment_status='paid' AND selected_disciplines not empty
AND status IN ('in_progress','completed'). Also fixed the assess()
method's guard from payment_status to form_payment_status.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>