Markdown Link Check Kit — Offline Broken Relative Links & Heading Anchors

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Description

Offline Markdown link and heading-anchor audit for developers and agents: find broken relative links, missing images, and dead #anchors in .md/.markdown/.mdx files using GitHub's slug rules, with a batch wrapper that checks many files or directories in one run and writes problems.csv plus summary.json for each input. Fully offline, standard library only, no network, no account, no git required, and inputs are hash-verified unchanged. Includes the upstream MIT mdlinkcheck tool unchanged with attribution, a batch wrapper, fictional samples, and tests. External URLs are never fetched, so a clean result means no broken relative Markdown links on these checks, not that every live link works.