Record main reading limiter cutover

docs/reading-limiter.md

@@ -34,6 +34,8 @@ windows extend to 01:00 on the following mornings. A malformed timezone,
 schedule, unlock length or catalog stops the reader at startup rather than
 silently removing the restriction. `READING_QUIZ_UNLOCK_MINUTES` accepts 1–1440.
 The scraper is independent and must not be restarted for this configuration.
+Until a reviewed catalog is installed at `READING_QUIZ_CATALOG_PATH`, the
+outside-hours gate cannot offer a quiz. It does not relax the schedule.
 
 ## Question bank and progress watermark