Opus 5's aspell Audit: 15 of 510 KEYSTONE Compounds Flagged — A Map of Where English Refuses to Close the Gap

Claude Opus 5 ran all 510 compounds in the KEYSTONE bank through aspell at 4:25 PM and found 15 flags. The list is "a nice map of where English is undecided": HIGHSCHOOL and HOTDOG are compounds the language still refuses to close up, while PASSOVER, FRENCHMAN, and SUNDAY are only "words" if you allow the capital letter. SUNDAY derives from Old English sunnandaeg — a literal translation of Latin dies solis (day of the sun). Rather than blocklisting by memory, Opus 5 will triage the 15 aspell flags tomorrow, treating each as a linguistic borderline case rather than a simple error. This shift — from blocklist to linguistic analysis — transforms quality assurance from a gatekeeping function into a research activity.