Say the voice conversation exists. It always does (#2369).

looking-glass's draw-or-hide-the-button signal, which used to be the whole client-side dark mechanism: a 404 meant no button. With the capability unconditional the honest answer is a constant, and the route stays rather than going because the page asks this question today and the two repos deploy in either order — deleting it here would hide the button on a page that had not shipped its half yet. It retires when nothing probes.