docs: implementation plan for PR 6 — lunch event
Bite-sized TDD tasks covering schema migration, auto-create hook,
lunch router (admin CRUD + mixed-permission upsertPick + member reads
+ manifest + CSV export + recap), email templates, two cron endpoints,
five-card admin UI on Logistics → Lunch tab, applicant dashboard
banner + picker, project-page externals strip, and the edition-settings
cleanup. Cross-references the design spec.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>