SC-10Ready for QA
Sitemap timestamps that tell the truth
Every page once claimed it changed at midnight, then at the deploy time.
Two separate bugs. A bare date parses to 00:00:00Z, so the whole sitemap claimed one instant. Deriving index dates from the route file's git time then collapsed them onto the deploy commit, because Vercel clones shallow.
An index now reports when its newest listed piece landed, from authored timestamps that survive the shallow clone.