Adds a new DISCORD_ALLOWED_ROLES environment variable that allows filtering
bot interactions by Discord role ID. Uses OR semantics with the existing
DISCORD_ALLOWED_USERS - if a user matches either allowlist, they're permitted.
Changes:
- Parse DISCORD_ALLOWED_ROLES comma-separated role IDs on connect
- Enable members intent when roles are configured (needed for role lookup)
- Update _is_allowed_user() to accept optional author param for direct role check
- Fallback to scanning mutual guilds when author object lacks roles (DMs, voice)
- Fully backwards compatible: no behavior change when env var is unset
0xyg3n
541a3e27d7