Well sure, corporations can be recognized by the state. That doesn't mean they require the state. There's nothing about legal personality or limited liability that requires "use of force"

Every law is underwritten by the potential use of force by agents of the state. Sometimes you have to go through several laws to see that (you ignore liability -> you get sued -> you ignore lawsuit -> you lose -> you are ordered to pay -> you ignore payment -> (if you have money in bank, it is taken from you; go to beginning of loop, this time with respect to bank | if you don't have money in bank, but do have money and spend it, you'll be eventually likely be arrested for contempt of court, but an agent of state applying force)

Law without an underwriting by law enforcement is not more than convention.

This argument is tautological and IMVHO disingenuous. Yes, governments do provide legal protections for corporations but it's not the essence of what a corporation is. It's capital and a group of people which is perceived as separate in some aspects from its members.

I would guess that even hunter gatherers were organizing limited liability ventures like hunting parties.