Excitingly, the talented coreboot folks have found a way of disabling much of Intel's Management Engine:
miniblog.
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Copilot doesn't offer a way of disabling completion inside comments. People have discovered a comical workaround: swearing in the comment!
The design of Emacs' transient-mark-mode, and why power users might want to try disabling it: https://spwhitton.name/blog/entry/transient-mark-mode/