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Scrum trunk doesn't have the same ring to it I suppose.

Because it means "mastery of the subject matter" and not "master of other people/things".

I see it actually interpreted (by scrum "masters") as "master of the scrum teams".

This is not how your typical scrum master interprets it. :)

master/slave for drives?

master for main branch?

Masters have slaves. Which is exactly how workplaces implementing scrum view developers. Slave to the business and really the lowest level worker ant.