get_schedule_for_date, show_items_for_deletion, and send_reminders were
querying events with Event.date == date_str, which only matches one-off
events or a recurring event's anchor date. Recurring events on later
occurrences (and any per-date exception overrides) were silently
skipped, so /today could show just one event when several were
scheduled. Switched all three to materialize_events, already used by
the web frontends, which correctly expands recurring events.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>