WP MCP 0.8.90: Classic Oxygen (4.x and earlier) pages can now be read

WP MCP 0.8.90 is out. Here is what changed in this release:

• New: classic Oxygen (4.x and earlier) pages can now be read and edited structurally through get-builder-content and update-builder-content. Update, add, remove or move one element by path, or replace the whole tree; untouched elements, including ones wpmcp does not know, keep their exact bytes, and every write is undoable with rollback.
• Classic Oxygen writes keep the JSON tree and Oxygen’s signed shortcode copy in step through Oxygen itself, add an Oxygen revision, and refresh the page’s generated CSS after writes and rollbacks. Pages still in the pre-4.0 format are read-only until saved in Oxygen 4.
• The content mirror now exports and restores classic Oxygen pages.

Download it from the GitHub release, or see this release on the changelog alongside every earlier one.