Quit (quit event, window close, Alt+F4, from either SDL pump) used to
exit(0) immediately while the render thread could be mid-frame in the
driver: the likely trigger of the host's 0x119 bugchecks. Now quits are
requested; the render thread glFinish()es, unbinds the context and parks
at a frame boundary, and the host exits after (max 2 s). GE_QUITFRAME=<n>
gives the harness a clean self-quit; golden_gate.sh uses it.
Pins data/ge007.ini to a defaults-only 640x480 window (restored on any exit),
captures Bunker 1 at 640-1120:240 and runs framediff.py against the golden
baseline. --level/--dump give a capture-only smoke run (exit 0 = frames
captured and no crash). Full framediff output goes to scratch/.
James Dansereau