Older hosts strip terminal.send's inputKind (zod drops unknown keys), so a
forwarded xterm reply would land as ordinary floor-taking shell input. Hosts
now advertise terminal.query-reply-input.v1 via status.get and mobile drops
replies unless the host advertises it (pre-fix behavior). Also documents the
bounded desktop-to-mobile handoff double-reply residual.
Co-authored-by: Orca <help@stably.ai>