Do our slides follow the brand guide

Checks a slideshow against the confirmed brand guide ({"slideshowId": "..."}) and lists, slide by slide, colours outside the palette, text that is hard to read, a missing logo, banned phrases and fonts that are not the guide's (rule: palette, contrast, logo, bannedPhrases, fonts; message is a sentence to read out). Advisory only: nothing is blocked. Looks at designed and dynamic slides, not slides inside an uploaded presentation. followsGuide is true when nothing drifts; hasConfirmedGuide is false when there is no guide to check against. A summary count also appears in GET /v1/workspace/health.