Indeed most of your examples are not property.

All of them are property, technically. Including contractual rights (which can be bought and sold). And plenty of these intangible rights don't arise from contract. How much of the world's land is owned by people who trace their purchases/inheritance to an original owner who was granted the land by a government or royal family no longer in power? Including through conquest and wars ended by treaties (of questionable consent when you consider the coercion and duress that losing a war creates). The consensual transactions downstream from that system that nobody today consented to don't actually limit the legal power of that ownership.

the most important thing about contracts is that they're voluntary, and negotiated between the parties

That's true of contracts, but not true of all the rights that can get transferred around from contracts. Some governments gave homestead rights transferring land to anyone who built a house on that wilderness. How is that conceptually different from a king-granted monopoly to someone who invented something for the British Navy?

And then there are other forms of rights. If you crash into my house and I sue you, I might win a court judgment ordering you to pay me a certain amount of money. You didn't consent to that, but you owe it just the same. And that right to payment can be sold, and is considered property as well.

People hold out intellectual property to be something unusual and different, but really it's not that different from accounts receivable and stocks and bonds and leaseholds and licenses and other forms of intangible property.