Implement `/verify` (wallet/zkHash → on-chain check → roles)

[skylessdev]

Scope

• /verify <id> where <id> = wallet or zkHash.
• Query VPNLRegistry (e.g., getReputation(id) → (score, roleCode, updatedAt)).
• Enforce: score >= MIN_SCORE and now - updatedAt <= 7d.
• Map roleCode → Trader/Solver/LP; always grant 🔷VPNL Verified.
• Remove Guest on success.
• DM success/failure; log to #mod-log (user, id, score, roles).

Acceptance Criteria

• Valid users get roles and access; invalid remain Guest.
• Log entry includes timestamp + score + link to block explorer (if you include tx refs).
• Error handling for RPC/contract failures with friendly retry.