When context compression triggers a mid-turn session split, source.thread_id
can be None on synthetic/recovered events. _thread_metadata_for_source then
returns None, causing the Telegram adapter to send with no message_thread_id
and the response lands in the General thread instead of the active DM topic.
Fix:
- hermes_state.py: Add get_telegram_topic_binding_by_session() for reverse
lookup by session_id (enabled by the existing UNIQUE INDEX on session_id).
- gateway/run.py: After session-split detection, if source is a Telegram DM
and source.thread_id is None, recover it from the binding via the new
method so _thread_metadata_for_source produces the correct thread routing.
- tests/: Coverage for the new lookup method and the recovery flow.
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