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generate_db: add by_sha256 index for O(1) variant lookup. verify: _find_best_variant uses indexed sha256 instead of O(n) scan. validation: check_file_validation returns (reason, emulators) tuple, attributing mismatch only to emulators whose check actually failed. beetle_psx: remove incorrect size field for ps1_rom.bin (code does not validate size, swanstation is sole size authority).