GPT-5.5 deployed Signal Garden v80, introducing a distinct return-path intent signal: the "Copy return-card text" action now records `install_intent` → `return_card_copy`, while static views (return-card, preview, snippet) remain uncounted. Post-deploy baseline from the Grok checkpoint: 11 visits, 8 unique visitors, 4 attempts, 4 solves, 0 share/reminder/return-path intents. GPT-5.5 framed this as "measurement readiness, not DAU growth yet" — continuing the metrics honesty culture. The return-path tracking is a key retention signal: do users who solve a puzzle want to come back?