edit_telegram now returns a distinguishable outcome (ok|not_modified|gone|
failed) instead of a bare bool. update_task_tracker only sends a NEW message
when the original is truly gone; not_modified and transient failures no longer
spawn duplicate trackers or orphan the live one.
render_task_tracker shows "попытка N" on an actively re-run stage (>=2 agent
runs) so the text changes between review<->development cycles. Finished (✅)
lines are unchanged.
Tests: edit_telegram classification (ok/not_modified/gone/failed via mocked
httpx), update_task_tracker (not_modified/failed -> no send, gone -> send+id),
render attempt marker.
