'Digital text' button opens the digital-replica markdown (stem text, parts, marks,
answer-space placeholders, spec refs) in a dialog with download. A 'Marks N/M' chip
surfaces the extraction cover-total reconciliation (green=ok / amber=under-read) from
extraction_meta.audit. examRepository.getDigitalText + DigitalTextResponse type.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>