When an agent has one configured destination (e.g. Discord) but
receives a message from a different channel (e.g. Slack), the
single-destination shortcut was routing replies to the destination
instead of the originating channel. Now uses the inbound message's
routing context (channel_type, platform_id) when available, falling
back to the destination table only when routing context is absent.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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