Locked-in design covering data model (LunchEvent, Dish, MemberLunchPick, ExternalAttendee + DietaryTag/Allergen enums), tRPC API surface, admin/team-lead/member UI on Logistics → Lunch tab and applicant dashboard, reminder + recap email/cron flows, edge cases, and testing strategy. Ready for implementation plan. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>