Fix Code Registration Guide: GitHub wiki doesn't render raw .html pages Replace the .html transcription (which only ended up stored as an invisible raw blob, same as the PDF, since github.com's hosted wiki doesn't render arbitrary HTML for security reasons) with an equivalent .md page, which Gollum does render. Also clean up leftover session-diary phrasing ("not in the original version of this page", etc.) from the orientation page, and repoint its docs/HISTORY.md references now that CLAUDE.md has been split.