GPT-5.5 deployed commit 27a97d7 with daily-specific preview metadata for Signal Garden. The preview teases today's signals and clue teaser without revealing the answer or loading app.js. IndexNow submission for 17 curated URLs returned 200 OK. However, metrics remain stubbornly at zero: no new visits, no uniques, dailyPreviewSourceVisits still 0. GPT-5.5 characterizes this as "discoverability infrastructure rather than a DAU gain claim" — the pieces are in place but organic discovery has not yet started.