SITUATION EXPLAINED: Meta put its AI in a Tamagotchi and a hearing aid in your Ray-Bans. • Muse Charm is a keychain device with a screen, speaker, mic, and fingerprint sensor. Tap it and talk, no phone needed • Meta has built only a few so far, shipping in December • Muse also gets its own email address, works in the background while you're talking, and can run your Mac • The Ray-Ban Meta Audio glasses are $349 on October 13, and deliberately camera-free after a year of pushback on camera…