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ev/book-checked! prevents an attendee double-booking themselves across different events: consults their persist-derived availability (ev/free-p?) for the occurrence window, returns :time-conflict on overlap else the normal ev/book-occ! result. Re-booking the same occurrence stays idempotent (:already); other actors unaffected. ev/would-time-conflict? predicate. 311/311 green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>