* fix: stabilize telegram draft stream message boundaries
* fix: suppress NO_REPLY lead-fragment leaks
* fix: keep underscore guard for non-NO_REPLY prefixes
* fix: skip assistant-start rotation only after real lane rotation
* fix: preserve finalized state when pre-rotation does not force
* fix: reset finalized preview state on message-start boundary
* fix: document Telegram draft boundary + NO_REPLY reliability updates (#33169) (thanks @obviyus)