md-review — Code-review markdown → 2-column HTML

The code-review converter from Tier 2 of Shihipar's essay ("Code Review and PR Writeups"). Takes a markdown PR writeup with diff blocks + severity callouts and produces a single-file HTML review with a jump-nav, 2-column diff + annotation layout, and a named reviewer footer.

Three stdlib tools pipeline together:

diff_parser.py  →  annotation_extractor.py  →  review_html_renderer.py
   (md → diff hunks)   (md → severity-tagged    (hunks + annotations
                        annotations attached     + tokens → 2-col HTML)
                        to nearest hunk)

When to invoke