Batch pass with the updated guide. Pushing the lessons that came out
clean at 100% cassette coverage: book-1-lesson-4, book-4-lesson-1/2/4,
and the new book-4-lesson-5 (ST-only review). All now use the correct
"Book N · Lesson N: <title>" module-title form.
Held for review (over-dropped cassette content this run, flagged by the
coverage check): book-1-lesson-1/2/3 and book-4-lesson-3. book-1-lesson-5
(review) is blocked on 29 ungenerated ST images.
Co-authored-by: Cursor <cursoragent@cursor.com>
