The lifter dropped decimal mode: SED/CLD were NOPs, all BCD score math ran binary

lifter.py lifted SED/CLD into the generic flag-NOP bucket, so the standard 2600 score idiom (SED / CLC / ADC score / CLD — Pac-Man's add-score routine at $FC45, and the same shape in most of the era's library) silently performed BINARY arithmetic: ten dots showed $0A instead of BCD $10, corrupting every displayed digit past 9. Fix: cpu->decimal_mode flag in CpuState; SED/CLD NOP-comments now emit set/clear; ADC/SBC emission branches at runtime into…

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