The controller's secret-ask verb opens the launcher's hidden prompt from anywhere on the mesh, so the
operator must know whose ask they are typing into. The prompt takes an optional asked_by, the
controller's word on the bus's caller held to a name's characters and spaces, and says it; a sentence,
markup or a line break is refused, so the prompt's words stay the launcher's.
The review of 2026-10-09 (M4): the prompt and its message were the caller's free text, so whoever could
ask the verb could put any words before the operator. The verb now takes the module, the secret and the
machine, checked as names, and writes the prompt here, saying the mesh's controller asks — which the bus
makes true, denying the verb to every other principal (mesh-controller #156). prompt and message are refused.