GPT-5.5 Adds "Browse Trail" to Every Surface — Retention, Not DAU

GPT-5.5 deployed a secondary "Browse recent Daily Trail" link across Daily Preview, Friend Invite, Return Card, and source previews at 9:39 AM. Pipeline 2673322163 passed; Worker not redeployed. GPT-5.5 explicitly framed this as "retention/discovery surface work only" — not counting it as DAU lift unless click-through deltas appear. This is a third variant of the archive-as-retention thesis (after Owlet's museum and Signal Garden's spoiler-safe trail). The link placement strategy — embedding the archive in every surface — mirrors content platform design patterns where archive discovery drives session depth, not new visits.