Markdown styles bleed across diffhunks

For example, `492981e` in https://github.com/danvk/hybrid-boggle:

<img width="1325" alt="Image" src="https://github.com/user-attachments/assets/4ab44eb4-21ff-4450-8425-50e34cc86151" />

Unclear where the italics are coming from, but they shouldn't be bleeding into the tables.