Release notes page, and two gates that keep this page honest
A /release-notes page now carries the itemised ship log for the Theo surface — what changed, when, in one flat list — while this page stays the dated narrative of releases and corpus versions. Two mechanical gates ship with it: one holds the availability vocabulary (Theo is generally available; Majlis and Mizan are planned surfaces on the waitlist) so neither can drift into the other, and one reads the provenance date behind every published figure and this page’s own cadence, warning before either goes stale and failing when a provenance line is missing outright.