### DF-0983 FIXED (-DFIXED) build+run
FIX: off=127 would overflow rom[1016..1023] (size 512) -> skipped
chip=0x10  rom_size=512
crafted off=127 -> writes rom[1016..1023] (0x3F8..0x3FF)
OOB writes past rom end: 0  (max index 0)
RESULT: NO OVERFLOW (fix bounds check active)
rc=0