feat(main): periodic \r progress for simulation when stderr is a TTY#361
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Prints "Simulated N / Max runs" (or "Simulated N runs" when unlimited) to stderr every 100 runs, overwriting the same line via \r and clearing trailing chars via \033[K. Helps users see that long simulation runs are making progress. Silent unless stderr is a TTY, which: - Keeps log files / pipes / test_references.py output clean. - Keeps parallel worker logs clean (each worker's stderr is a regular file when redirected by the fizz wrapper, not a TTY). - Works correctly under interactive SSH (PTY allocated -> TTY) and tmux/screen; silent under scripted ssh without -t and under `... 2>&1 | tee log` (stderr becomes a pipe). A small clearProgressLine helper emits a trailing \n to stderr before the post-loop "Stopped after N runs" line and before in-loop failure prints, so the next output starts on a fresh line instead of being appended to the progress line. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Prints "Simulated N / Max runs" (or "Simulated N runs" when unlimited) to stderr every 100 runs, overwriting the same line via \r and clearing trailing chars via \033[K. Helps users see that long simulation runs are making progress.
Silent unless stderr is a TTY, which:
... 2>&1 | tee log(stderr becomes a pipe).A small clearProgressLine helper emits a trailing \n to stderr before the post-loop "Stopped after N runs" line and before in-loop failure prints, so the next output starts on a fresh line instead of being appended to the progress line.