Validate Plan

Checks a design plan, the file that maps a brief's content onto pages before they are built, and returns every structural error it finds. It confirms that required content is assigned to a page, that slot assignments point at content that exists, that each named format is in the format catalogue, that the duration is within range, and that no two pages share a name.

The plan must have an id, a brief, a content map and pages, or it is rejected before the detailed checks. It is for people producing multi-page decks and sequences from a plan who want mistakes caught before the pages are made.

It changes nothing. It currently runs inside Syvon and checks format names against Syvon's catalogue.