05eae39c84
- Dropped the terminal split artifact so repeated saves no longer grow a blank line per write. - Replaced the partition-and-concat merge with an ordered line list: headings, prose, and footers keep their positions; new lessons insert at the head of the first bullet run and the cap trims oldest bullets. - Strengthened tests to byte-exact idempotence and mixed-Markdown order. - Review follow-up for PR #6774.