Demote per-book and per-chapter-list-page Info logs to Debug — these
fire hundreds of times per catalogue run and drown out meaningful signals:
- orchestrator: RunBook starting (per book)
- metadata saved (per book)
- chapter list fetched (per book)
- scraping chapter list page N (per pagination page per book)
The 'book scrape finished' summary log (with scraped/skipped/errors
counters) remains at Info — it is the useful signal per book.