Host-side (vitest):
- Routed message preserves platformId/channelType/threadId on messages_in
- Fan-out gives each agent correct per-agent routing
- writeSessionRouting populates session_routing from messaging group
- writeSessionRouting writes null routing for agent-shared sessions
- Per-thread session includes thread_id in session_routing
- Agent-shared resolves to same session on repeated calls
- Agent-shared session has null messaging_group_id
- findSessionByAgentGroup returns channel-bound session (documents #2332)
- Skip: agent-shared/channel-bound coexistence (blocked on #2332 fix)
Container-side (bun:test):
- Internal tags stripped between message blocks
- Mixed task + chat batch with correct routing
The agent-shared tests uncovered the exact bug from #2332:
findSessionByAgentGroup doesn't distinguish agent-shared from
channel-bound sessions, so A2A resolution reuses a channel session
when one exists.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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