fix(gateway): pin Telegram DM-topic routing to user's current topic#28513
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Topic-mode DM replies were fragmenting one conversation across many sessions: a Reply on a message in another topic delivered Telegram's message_thread_id for *that* topic, and #3206's strip routed plain replies to the lobby. Both pulled the user away from their current session. Fix: when topic mode is on, rewrite source.thread_id to the user's most-recent binding if the inbound id is missing/General or not a known topic. Non-topic-mode users unchanged.
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Salvage of #26609 (@karthikeyann). Two routing bugs in DM topic mode:
_build_message_eventstripsmessage_thread_idfor non-topic messages (PR [Bug]: Telegram DM sends fail with 'Message thread not found' — spurious thread_id from reply chains #3206), routing topic-mode replies to no-thread lobby session.Fix: pin routing to the user's current topic instead of trusting inbound
message_thread_id.Authorship preserved via cherry-pick. 36/36 topic-mode tests passing.