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`run_headless_commands` read `crossterm::terminal::size()`, and the page size decides where `page-scroll` lands, so one script wrote a different record in a different window — and CI (no tty, 80x24 default) disagreed with a shell. Pin it to 80x24 in `HEADLESS_EXTENT`. The test drives two sizes through LINES/ COLUMNS with the child detached by `setsid`, and asserts the same record. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze