Record the two concrete prerequisites for compositor input wiring, found by
reading the compositor source: (1) an event-loop restructure — it uses a
blocking accept loop, drains keys only reactively, and ClientState stores no
UnixStream, so no input source can push wl_keyboard to a client; (2) the
desktop cannot run without DRM/Mesa (no /scheme/drm/card0 on mini), so the
wiring is unvalidatable until the Mesa EGL/DRI port lands. Defines the exact
wiring for when those clear (read /scheme/evdev, set_vt_mode, real XKB keymap
fd, keycode = evdev - 8).
vasilito
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