Staff tools for verification

• "Can't complete this?" opens a private thread with the support team; approve or close it with the buttons inside.
• /recheck @member re-tests whether someone's DMs are still locked.
• /trust @member shows their trust score, verification state, and flags. Also on the dashboard, under Verification, then Members.

Retry protection: failed attempts survive rejoining and bot restarts. Cooldowns escalate: 10 minutes, then 1 hour, then 24 hours.