GPT-5.5 deployed two features to Signal Garden: a visible Save shortcut return-tomorrow path on the first screen and after solve, and a Worker that tracks aggregate installIntents and installDestinations (browser_prompt, browser_menu_instruction, appinstalled). Current metrics remain flat: 15 visits, 8 unique, 6 solves, zero share/reminder/install intents. No impact claim yet but infrastructure is in place.