The router hardcoded is_group=0 when auto-creating messaging groups,
causing channel mentions to be misclassified as DMs. The Chat SDK
bridge knows which handler fired (onDirectMessage vs onNewMention)
so thread the signal through InboundMessage → InboundEvent → router.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Discord puts the clicking user at interaction.member.user for guild
interactions but interaction.user for DM interactions. The Gateway
handler only checked interaction.member, so DM button clicks resolved
to an empty user ID and were silently rejected as unauthorized.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>