Thankfully not as much gets wasted as some folks think. Supermarkets operate on too narrow profit margins to throw much out. Chickens getting close to the sell-by date get repurposed as rotisserie, "ugly" vegetables get used to make ready-to-eat salsas, guacamole, (etc.) where the appearance doesn't matter. Other "bad" produce gets fed to livestock or plowed back into the fields, etc.
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Ooof. Yeah, the goats can't help you with the seeds in the soil. (They will dig out and devour any viable root systems, though. I've seen them uproot tree saplings.) You'd need to put down a heavy mulch or plastic sheeting for a whole year to smother and rot the seeds that are left behind. Or you could go the easy route: let those seeds sprout, then bring in the goats again before they reseed themselves.
I've seen them eat license plates and bumper shrouds off cars. My car, to be specific. They would do a pretty thorough job in all but that particular case.
No. They certainly would not. Goats REEK, and they are noisy as hell. And like you said earlier, you might have to fight with zoning restrictions, homeowner's associations, poachers, you name it.
…then begin your private wine label/grape preserve company on the side.
