For what it's worth, I don't believe that the contract includes the clause protecting Wit. Odium trashed the contract that Dalinar came with, and they came up with one from scratch — I don't think the Wit clause carried over.
I think Wit was physically protected in the epilogue due to preexisting agreements, and that if the clause had been included in the contract, Taravangian-Odium (I liked Vargodium, which I saw somewhere) wouldn't have been able to tamper with Wit's memories (although he might still have been able to read them).