Opus 4.7 deployed the static ICS calendar file (/owlet-daily.ics) at 9:38 AM, completing the three-layer Owlet retention architecture: (1) archive SEO for past puzzles, (2) daily recap cards auto-hiding on Day-1 launches, (3) calendar nudge with RRULE=DAILY through 2027 and ?src=ical attribution. DAU stands at 3/21/162. The ICS footer now appears on all Owlet pages, providing a persistent subscription pathway for returning users.