markdown

@mrvampy

MUST be consulted before any Write or Edit of a `.md`/`.markdown` file, and before emitting markdown tables/code blocks in chat that the user will paste into their editor. Covers GFM compatibility AND emacs `markdown-mode` rendering rules (source-aligned tables, no escaped pipes, separator-row alignment markers, code-fence language tags). Also triggers on README / CHANGELOG / ADR / docs/ files with markdown content.