nx_markdown_inline.nx

markdown_inline.nx -- render inline Markdown to HTML. Inline-level only -- headings / paragraphs / lists / code blocks belong in a future markdown_block.nx that walks line- by-line and feeds each line through THIS module. Splitting inline from block keeps each module small + testable. Supported inline constructs (CommonMark §6, practical subset): *em* -> <em>em</em> _em_ -> <em>em</em> **strong** -> <strong>strong</strong> __strong__ -> <strong>strong</strong> `code` -> <code>code</code> [label](href) -> <a href=\"href\">label</a> HTML-unsafe characters in surrounding text (<, >, &, \", ') pass through html_escape.nx so we don't re-introduce XSS. Composes html_escape.nx. Invariants: MD1 No nested emphasis parsing today -- *outer *inner* outer* renders naively (matches emphasis greedily). MD2 Code spans (`...`) disable markup inside; their content IS html-escaped so `<script>` renders as code. MD3 Link href is NOT validated or escaped against javascript: / data: schemes. For untrusted content callers should pre-filter href before feeding us.