Meta’s Muse, a personal AI agent that books travel, fills out forms, and shops on a user’s behalf, has already proven popular with the masses, but a new side project could be particularly alluring to tinkerers and hackers. On Friday, the company introduced Muse Gadgets, an open-source project that lets developers build their own hardware that connects to Muse. Meta is providing open-source firmware (the low-level software that runs a device), and a Linux software development kit (SDK), along with a few project ideas to get users started. These include giving Muse a color e-ink display or…