Uses the book's own lettered Inhalt structure (Abschnitt A-Q) instead of
per-sub-exercise files, since sub-exercises are often half a page each.
Section A covers Person, Familie und Freunde (pp. 8-18), cross-referenced
against Menschen Lektion 1 and 3.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
