How did you discover Passcode?
Same, honestly at first when I clicked on this post I thought passcode is a new password manager or something.
should I care about Coreboot or Libreboot yet if I don't have Libre or supported Hardware?
Can't check right now, but I think the option you saw in the kernel config is for a driver to interact with the ME. Intel Management Engine has an interface called HECI for firmware and operating systems to query status and get event messages. It probably is also used to configure other stuff like AMT remote management.