PHLEGM NES/NROM smoke cartridge

PHLEGM-NROM-SMOKE.nes is an original test fixture created for PHLEGM.
It contains no Nintendo or commercial-game code/data.

iNES layout:
- mapper 0 / NROM
- 16 KiB PRG ROM mirrored at $8000-$FFFF
- 0 CHR-ROM banks, therefore 8 KiB CHR RAM
- horizontal nametable mirroring
- RESET/NMI/IRQ vectors all point to $8000

The program initializes basic 2A03 CPU state, writes $42 to CPU RAM $0002,
then loops forever at $8009. It exists to validate cartridge parsing, NROM
mapping, reset-vector execution, RAM mirroring, power/reset persistence, EJECT,
save-state/session cartridge persistence, and ROM write protection.
