scrcpy cannot talk to headless emulators inside the container: the
AOSP ATD image lacks framework pieces (KeyCharacterMap NPE) and there
is no GPU/KVM in the container at all. The script boots the android-tv
image image on the host with -gpu host and a window (so the RSA dialog
is clickable), installs the current debug APK and leaves the app
running; the container's socat bridge then exposes it as
rutherford:5556 for adb/scrcpy from anywhere.
