Six test cases covering:
- DISCORD_ALLOW_BOTS=mentions + bot not in DISCORD_ALLOWED_USERS → authorized
- DISCORD_ALLOW_BOTS=all + bot not in DISCORD_ALLOWED_USERS → authorized
- DISCORD_ALLOW_BOTS=none → bots still rejected (preserves security)
- DISCORD_ALLOW_BOTS unset → same as 'none'
- Humans still checked against allowlist even with allow_bots=all
- Bot bypass is Discord-specific — doesn't leak to other platforms
Guards against a regression where the is_bot bypass in _is_user_authorized
gets moved, removed, or accidentally extended to other platforms.
7d888ab49c