3481

Added

• Mednafen rcheevos Memory Regions (Phase 1) -- Wire per-system RAM pointers for RetroAchievements integration: PSX (2 MB), NES (2 KB), SNES/snes_faust (128 KB WRAM), PCE/PCE-CD (8 KB), SuperGrafx (32 KB). Saturn excluded pending uint16 byte-order correction. achievements remain inactive until Phase 2 (rc_client session) is wired in issue #3380