mlr3book

Diagnose and fix CI failures in the mlr3book's render workflows (build-book, book-weekly, book-dev-weekly). Use when the user mentions mlr3book CI failures, the book not rendering, a weekly build failing, or asks to "fix the book", "check the book CI", or "maintain the mlr3book".

Review new chapters and sections in the mlr3book for compliance with the book's style guide and chapter structure requirements. Use when the user wants to review a chapter, section, or .qmd file from the mlr3book. Checks R code style, English writing conventions, Quarto formatting rules, and required chapter structure (front matter, introduction, conclusion) defined in the mlr3book style guide (https://github.com/mlr-org/mlr3book/issues/434) and structure guide (https://github.com/mlr-org/mlr3book/issues/435).