`capture_output=True` collects stdout for every violation in these large repos, but the test never inspects stdout. Consider discarding stdout (e.g., redirect to DEVNULL) and only capturing stderr to reduce memory/IO overhead and avoid huge buffered output on larger repos.

[steven-cutting]

capture_output=True collects stdout for every violation in these large repos, but the test never inspects stdout. Consider discarding stdout (e.g., redirect to DEVNULL) and only capturing stderr to reduce memory/IO overhead and avoid huge buffered output on larger repos.

        stdout=subprocess.DEVNULL,
        stderr=subprocess.PIPE,

Originally posted by @copilot-pull-request-reviewer in #58 (comment)