No, it does not. It’ll bug the shit out of you to upgrade, but it won’t automatically do a major version upgrade. By default it will automatically do minor version upgrades (that can be turned off).

That’s what makes the LLM bug report make no sense in light of OP’s report here. Bug says it’s a regression from 25.x (which doesn’t exist), so maybe they mean 15.x? But OP says they “woke up” and it was upgraded and broken, but macOS doesn’t major version upgrades w/o user action. So which is it?

No.