mdast to nlcst Transformer

mdast-util-to-nlcst is a utility in the unifiedjs ecosystem that transforms an mdast (markdown abstract syntax tree) into an nlcst (natural language concrete syntax tree). Currently at stable version 7.0.1, the package follows a semver release cadence with notable breaking changes often accompanying major version bumps. Its core function is to allow inspection of the natural language content within markdown documents by providing a structured NLCST representation. Unlike other utilities like `mdast-util-to-hast` which converts markdown to HTML, this package focuses specifically on language processing. It is frequently used in conjunction with natural language parsers like `parse-english` or `parse-latin` and is wrapped by the `remark-retext` plugin for a higher-level abstraction. A key limitation is that it does not provide functionality to apply changes from the NLCST back into the original mdast tree.