I will be curious to see what your lawyer says. I do not practice contract law but the way it is worded and the 2 items that you require the new owner to satisfy are going to be to your disadvantage. The wording of the contract is vague and non-specific to the issues that really affect the quality of life for a horse. The new owner can meet your first item by providing a little run and a lean-to. The second item can be met by them going out and doing a self-trim every 4 weeks. Sorry but it is best to leave the legal jargon to the JD's.
I do want to comment that the recording of another person without their knowledge and consent may be illegal and regulated by statue in many states.
Best to check before you are the one who gets in a bit of hot water.
I'm sorry but I highly doubt the contract will hold up at all.
Always get an equine lawyer to look such things over, and always charge a rehoming fee. In most states a horse is property, so you have to be careful with such things as custody. If you want something done your way, you do it. Do not trust anyone, especially when its free.
Please use this to learn a valuable lesson. Ask a lawyer to write up a contract next time. Your contract says nothing about the horse's body condition, feeding, immunizations, worming, water access,
Your contract doesn't say who they have to let do this horse's hooves. Heck, you might have difficulty defending that in court as many horses don't get their hooves done and, if a horse develops some hoof disorders, shoes might save a horse's life. Your contract says the horse cannot have shoes.
I'm not a lawyer either but I'd bet that your contract contains some unenforceable items and leaves out an awful lot of important things.
The thing is this...it does not appear that they even have to let you visit this horse. If you're not nice to them they may not allow you to visit this horse or know a thing about its condition.
Sorry, but I have to agree with others that there are too many loop holes in your contract. I also have to agree with mls that if you feel a need to micromanage the situation, you really should have not given the horse away.