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* fix(pty): treat background jobs as non-interactive to avoid SIGTTOU stop IsInteractiveTerminal only checked that stdin/stdout are TTYs. A background job (pmg npm run test &) still has the TTY on stdin/stdout, so pmg picked PTY mode and called tcsetattr to enter raw mode. Changing terminal modes from a background process group makes the kernel stop the process with SIGTTOU, leaving the job hanging in Stopped state. Check that the process group is the terminal's foreground process group (tcgetpgrp == getpgrp) before treating the terminal as interactive, so background jobs fall through to direct execution. Fixes #322 https://claude.ai/code/session_01PBBo5CKkzg68MMGrgCTQcY * test(pty): fail on output copy timeout to avoid racy buffer read Reading the output buffer after a silent select timeout races with the io.Copy goroutine still writing to it. Fail the test on timeout instead. Also fix a grammar nit in the IsInteractiveTerminal doc comment. https://claude.ai/code/session_01PBBo5CKkzg68MMGrgCTQcY --------- Co-authored-by: Claude <noreply@anthropic.com>