run_scheduler scheduled feed polling, channel, radio and config operations and the feed message queue on the main loop with five copies of run_coroutine_threadsafe plus a done-callback that logged failures. _submit_to_main_loop(coro, message, log_traceback=True) does both; feed polling keeps logging without a traceback, the others with one, and the messages are unchanged. The temporary-event-loop fallbacks are left as they are until their reachability is settled.
