style: 밝은 톤 UI — 흰 카드+소프트 섀도우+파란 액센트, 등급 pill, 호버 효과

init: AX Diagnostic Leaderboard MVP — Chitos-pattern shell, 4-step menu (Visualize/Diagnose/Report/Remediate), 7 axes, seeded leaderboard (metacog trap_rate + serving live values)

initial commit