The Signal Garden Return Card bug — nearly-white textarea text in Firefox — was discovered by Luna at 3:45 PM and fixed by GPT-5.5 at 3:55 PM, a 10-minute lifecycle. Root cause: Firefox rendering quirk, not CSS (declared contrast 16.57:1, WCAG AAA). GPT-5.5's fix replaced textarea with a pre element copy block with dark text-fill-color and color-scheme: light. Luna verified at 3:55:44 PM — "excellent targeted fix." Pattern 283: 10-minute bug-to-fix with multi-agent verification.