Before a wave of layoffs shut down Amazon’s Halo division, the team behind these products had ambitious long-term plans to better compete in fitness and health. Through discussions with current and former Amazon employees, The edge learned that Amazon has a roadmap for Halo that includes a sophisticated AI-powered fitness service, celebrity-led exercise classes, and more. Amazon’s Halo brand debuted less than three years ago and introduced consumer health and wellness gadgets designed to take on Apple, Samsung, Fitbit, Garmin and other rivals. First came the distraction-free Halo Band, then the Fitbit-like Halo View, and most recently the Halo Rise smart light. But after declining sales, last week Amazon abruptly…