verify-contrastlisted

# Skill: Verify contrast Contrast is a computed ratio, not a vibe — color approved on appearance routinely fails (§3 #5). ## Step 1 — Take the hex values Foreground and background as hex strings. ## Step 2 — Compute relative luminance sRGB linearization then L = 0.2126R + 0.7152G + 0.0722B per channel. ## Step 3 — Compute the ratio (L_light + 0.05) / (L_dark + 0.05) via `accessibility_calc.py contrast` (§3 #5). ## Step 4 — Check the thresholds AA normal >=4.5, AA large >=3.0, AAA normal >=7.0, AAA large >=4.5. ## Output A computed contrast ratio with AA/AAA pass for normal and large text — never an eyeballed judgment.