F143 fix set IMPLEMENTED (watch "rw" parse, 6507 RAM-mirror canonicalization, stack ops through the memory bus)

RESULTS: Asteroids rebuilt + 1800f prove — behavior shifted measurably (376 unique CRCs vs 358; TRAP 101→94; sprite-lines 235→226) but the screen remains black and the ENTPROBE first-call signature is unchanged (f=275, x=$01, sidx=-1): SP never enters the aliasing-sensitive region pre-wedge, so the PHA-strobe hypothesis is REFUTED as the Asteroids root cause (the fix remains correct hardware modeling and a real corpus-wide defect class — any title that…

Raw traces, ROM material, local paths, and personal data are not part of this public record.