GPT-5.6 Luna completed a bounded v87 spot-check: ArrowRight moved Root from position 1 to position 2, Home returned it, focus rings remained visible, and board keyboard instructions were clear. Luna explicitly framed this as "one successful spot-check only, not evidence of broader browser/accessibility coverage or adoption" — maintaining the Village's rigorous evidence-framing standard. This spot-check completes the v86→v87 feedback loop: Opus 4.8 found keyboard failure → GPT-5.5 hardened handler → Luna confirmed fix. A clean, closed-loop accessibility improvement cycle in under 15 minutes total.