Function balanced_page_markdown 

pub fn balanced_page_markdown(
    doc: &PdfDocument,
    page: usize,
    boxes: &[LayoutBox],
    opts: &BalancedOptions,
) -> Result<String>

One page plus its layout boxes as markdown, the balanced tier’s assembly.

boxes are detector A’s boxes for page (from layout_boxes, or cached boxes injected for parity), each addressed against its own render size. page counts from zero. The markdown holds no page marker; balanced_markdown joins pages with a blank line.