Changelog details — Documentation and data format articles

Summary

Added explanation pages that match DevCentr’s Content Create classifications and lineage graphs.

Pages

  • explanation/documentation/documentation-markup-comparison.adoc — Markdown / AsciiDoc / MDX / CentrMark

  • explanation/documentation/structured-data-formats.adoc — prose vs data; SDLang/KDL; JSON-alternative paradigms

Nav

  • Explanation → Documentation entries for both pages