There is no way an author / project can control when someone is going to use their software 'in production', I would certainly argue that condition is the weake

There is no way an author / project can control when someone is going to use their software 'in production', I would certainly argue that condition is the weakest of indicators as to whether something is 1.0.0 or not. Aside from that, the other 2 indicators definitely do not apply to Node (API is not stable, there is not a lot of worry about backwards compatibility as you'll see in the upcoming 0.12 release). So no, Node is not '1.0.0' according to SemVer.