Previously, only the trade initiator could access the trade builder
because lookups used their Discord user ID. Now any GM whose team
participates in a trade can add players, view, and manage the trade.
Changes:
- Add _team_to_trade_key secondary index mapping team IDs to trade keys
- Add get_trade_builder_by_team() for team-based lookups
- Add clear_trade_builder_by_team() for team-based clearing
- Update add_team/remove_team to maintain secondary index
- Refactor 5 trade commands to use team-based lookups
- Add 9 new tests for multi-GM access functionality
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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