- Add drm_backend module with full KMS initialization:
DRM_IOCTL_MODE_GETCONNECTOR → CREATE_DUMB → MAP_DUMB →
ADDFB → SETCRTC → PAGE_FLIP
- I/O uses standard write+read on /scheme/drm/card0 (no libredox dep)
- Double-buffered with AtomicUsize-based flip
- DRM output preferred; falls back to VESA framebuffer
- composite_buffer integrated: writes to DRM back buffer, page-flips
- Cross-referenced with Linux drm_mode.h ioctl numbers
- Remove xkb_context_new on Redox (eliminates crash vector)
vasilito
7213524efc