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Phase 3 input chain wiring: udev-shim: when scheme:evdev is registered (by evdevd), probe for event0..event7 devices and create /dev/input/eventN nodes pointing to scheme:evdev/eventN. This bridges evdevd's evdev devices into the /dev/input namespace that libinput and compositors expect. libinput: remove -Dudev=false and add libudev-stub as a dependency. The libudev-stub recipe provides libudev.so that reads from scheme:udev (udev-shim), giving libinput a working udev enumeration path instead of stub functions that return NULL. Input chain is now: hardware → /scheme/input → evdevd → scheme:evdev → udev-shim → /dev/input/eventN → libudev-stub → libinput → KWin.