Deadline Markdown check: protect structure first

Under a publishing deadline, preview the content in the target renderer and check the highest-impact structure: title, headings, paragraphs, lists, links, and code blocks. Open critical links rather than trusting their visible labels. If images are included, verify they load and have useful alt text. Save the source before last-minute edits and avoid unreviewed formatting changes. A quick structural pass is more valuable than polishing individual words while a broken fence hides half the article.