Auto-fix Markdown formatting

mdsmith fix is the write side of the linter. It rewrites trailing whitespace, heading style, code-fence delimiters, bare URLs, list indentation, and table alignment directly in the file.

The fixer runs as a fixed-point loop: it applies every fixable rule, re-parses, and repeats until the document stops changing or it has run ten passes. Stabilization means one fix never undoes another.

Paragraph reflow is the one fix that stays off by default. Set rules.line-length.reflow: true to let mdsmith fix rewrap over-long prose paragraphs to the max width. The wrap is abbreviation-aware — it never breaks e.g. or initials such as J. R. R. Tolkien across lines — and it leaves headings, lists, tables, code, and generated sections untouched.

mdsmith check runs the same rules without writing. It is the read-only sibling for CI, returning a non-zero exit code when any rule fails so a pipeline can block the merge.

See the fix and check command references for flags and exit codes.