v0.3.0 - public leaderboard

• ^Gtrophy publish --handle you\ - opt-in leaderboard entry (anonymous handle, per-entry token, delete on request)
• Overall metric resists gaming: mean across ALL five axes, untested axes counted at the 1200 start; publishing unlocks after 5 unaided reps
• Leaderboard page: https://ashutosh-rath02.github.io/atrophy/leaderboard.html
• API: Cloudflare Worker + D1, loopback-free, honor-system by design