Weekly Markdown review: reuse a rendering checklist

For recurring Markdown posts, keep a short checklist: heading order, spacing before lists, fenced code language, link targets, image alt text, and mobile overflow. Preview the new text and compare it with last week's established layout. Update the checklist when a new failure occurs, such as a nested list flattening or a long URL breaking the page. The same preview routine helps catch formatting drift without requiring every post to be rebuilt from scratch.