We’ve chronicled, in great detail, the many layers of technology, services and solutions that have been wrapped around the world of education in recent years — and especially in the last year, which became a high watermark for digital learning tools because of COVID-19. Today, a startup called Merlyn Mind is coming out of stealth with a proposition that it believes helps tie a lot of this together in the K-12 classroom — a “digital assistant” that comes in the form of a piece of custom hardware and software to “read” natural voice and remote control commands from a teacher to …