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* fix(tui): let quit skip an interrupted run's unfinished step After Ctrl+C the synchronous agent stream keeps running until its next event. The run was a Textual thread worker, i.e. a thread on asyncio's default executor, which App.run() joins on shutdown (up to 300 s on 3.12) and interpreter exit joins again with no timeout. Quitting while a long step was still running therefore hung silently after the terminal had been restored, and further Ctrl+C presses only printed a traceback. Run workers on a daemon thread instead. Quit now waits visibly for running workers (an interrupted step still checkpoints, a finished run still saves its title) and refuses sends meanwhile; a second quit request exits at once. Report unexpected worker exceptions as an error row and end the run, since Textual no longer catches them. * docs(changelog): reference #7326 for the TUI quit-after-interrupt fix --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>