With DISPLAY set but XAUTHORITY missing or stale, the X server rejects the
connection, XOpenDisplay() returns NULL, and iokitd passed that NULL display
to eglGetPlatformDisplay(). Mesa's X11 platform expects a real Display there,
so iokitd faulted and launchd restarted it every 10 seconds while /tmp/lolsig.log
filled with frames (issue #140).
IOSurfaceRoot now checks the display first, stays at EGL_NO_DISPLAY and prints
one line when it is missing. createSurface() already returns KERN_FAILURE for
!hasDisplay(), so surfaces fail closed instead of the process crashing. The
destructor also skips eglTerminate() when no display was initialized.
Documents that DISPLAY alone is not enough on servers and SSH sessions, and
adds a display probe to tools/env-check.sh: it reports DISPLAY/XAUTHORITY and
warns when xdpyinfo cannot open the display that Darling will inherit.
Signed-off-by: zero <zero@localhost>
