The subprocess stdout was a pipe to the TUI. When the TUI exited, the
pipe broke (SIGPIPE) and killed the backup process. Now the subprocess
writes to a log file in WORK_DIR, and the TUI tails it for live
display. When the TUI exits, the subprocess keeps running because it
writes to a file, not a pipe. On restart, the log file is loaded to
show output for reconnected or finished background jobs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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