- chat-sdk-bridge: forward thread.id to the router for DMs so sub-thread
context survives into delivery. Previously hardcoded to null, which
collapsed every reply to the DM top level.
- router: when a DM (is_group=0) is wired as `shared`, don't auto-escalate
to per-thread — keep one session for the whole DM and let thread_id
flow through to the adapter.
- agent-runner poll-loop: defer follow-up messages whose thread_id
differs from the active turn's routing. Mixing threads into one
streaming turn sent every reply to the first thread because routing
is captured at turn start.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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