is there a canonical thing that captures the nuances of modern libertarian thought?
"Nuances"? No.
The conventionally accepted definition is that libertarianism is defined by the Non-Aggression Principle (NAP), which I've also seen called the Zero Aggression Principle (ZAP).
To be a libertarian in good standing you can believe anything you want as long as you reject the initiation of violence against people.
this territory is moderated