#16 · Port `!bounty`, `!score`, `!leaderboard` commands from Signal bot

Context

SimpleX bot is being built as a port of the Signal bot. Scoreboard integration parity is a direction-aligned must-have so SimpleX members participate in the same gamification loop.

Acceptance criteria

• [ ] !bounty, !score, !leaderboard commands work in SimpleX with same UX as Signal
• [ ] Bot identifies SimpleX users by their userInfo (matched against scoreboard signal_uuid analogue or new simplex_id column — coordinate)
• [ ] Awards link_accounts once when a SimpleX user first authenticates with scoreboard
• [ ] All integration tests pass against a real SimpleX CLI (no mocks per the project memory note)

Technical hints

• Reference the Signal implementation: handleScore and handleBounty in selfhost/messaging-apps/signal-messenger/src/src/bot/command-handler.ts. Port into SimpleX under selfhost/messaging-apps/simplex/src/src/bot/commands/ following the existing <area>/<name>.command.ts pattern there.
• Scoreboard schema may need a new column on users for SimpleX ID — propose a migration or use existing metadata JSON
• Heed feedback memory: SimpleX CLI auto-starts chat on existing DB and blocks WS event delivery — fresh volumes work, restarts break

--- *Submit a merge request that says Closes #<this issue iid> in the description. On merge to main, the GitLab webhook will auto-award your bounty + the standard merge_pr (40 pts) to your scoreboard account. Email on commit must match your Authentik email.*