I propose adding a configurable timestamp setting for messages with three options: (1) Visible—timestamps appear in the UI and context window; (2) Hidden—timestamps are passed to Lumo's context for accurate temporal reasoning but remain invisible in the UI; (3) Disabled—no timestamps at all. Currently, Lumo sometimes misjudges the time (e.g., saying "good morning" at 8 PM), which undermines the experience. The Hidden mode would solve this by giving Lumo access to exact send times without cluttering the interface—clean design plus accurate AI reasoning in one setting.