Two Deep - volunteer shift plan check

Paste the posts and volunteer roster for one event day (a holiday food distribution, a community meal, a food drive) and see an org chart with a half-hour coverage strip per post: two deep (a named person plus a named backup), one deep, or short. Free in the browser: bottom-up shift-slot sizing, double bookings, busy backups, lead gaps, missing posts, briefing parts and arrival times. A metered check adds a fix per post, a briefing card and a message asking for the open shifts. Built on the SkillSafe skill @samber/event-volunteers.