Require Activity is a minimum, not maximum-one

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Complex-event Require Activity requires each attendee to have at least one activity ticket. It does not enforce a maximum of one, and the activity-selection flow exposes no global mutually-exclusive-activities control. If alternatives must be exclusive, assess a redesign using main ticket options or one activity's ticket choices and test guest/quantity behavior; do not assume it changes existing separate activities into an enforced single choice.