Keyboard + ARIA assertions on the compiled components: focus management (Dialog/Drawer initial focus, Tab trap, restore-on-close, Escape), roving tabindex (Tabs, SegmentedControl, Menubar arrow keys), combobox pattern (aria-activedescendant), and role/label contracts (Rating, InputOTP, DataGrid aria-sort, Carousel, Popconfirm, live-region roles). Loads _ds_bundle.js (compiled end of turn) — re-run on a fresh turn after editing component sources. Per-test 8s + suite 60s watchdogs; verdict on window.__a11y.