Boots its own emulator on a private socket and port, so it neither disturbs a
run.sh session nor fights it for the single-client QMP socket.
The unit tests stub QMP and therefore cannot catch a wrong QMP command. That is
not hypothetical: pmemsave and memsave differ only in physical versus virtual
addressing, and pmemsave fails by silently returning zeros. Check 2 asserts the
frame has lit pixels for exactly that reason.
Six checks, all passing: PNG renders, screen has content (1883 lit pixels), a
MENU tap changes the screen, the guest is still running after streaming, PTT is
rejected with 400, and /stream is multipart with a PNG part.
Waits 16 s before the first press, past power-save entry, so it also covers keys
working once the radio is asleep.
