Function read_file_lines_within 

pub async fn read_file_lines_within(
    cwd: &Path,
    rev: &str,
    path: &str,
    ceiling_bytes: u64,
    budget: Duration,
) -> Result<FileLines, FileReadRefusal>

read_file_lines with its command budget spelled; see the module’s sibling readers for why the budget bounds the machine, not git.