Mathematical proofs aren't generally agreed.

Yes, they are. Have you seen the controversies around many recent proofs? Proofs are getting so long and topics so specialized, that simply just reading them takes for ever. Some important ones have only been checked by one or two people. Some have been out for years and are still controversial, because no one claims to have some the immense work to actually checked them. That's one of the reasons why proof assistants are used in the first place. They help, but they come with their own problems and challenges.

This is why ethics has failed. It has been built on the unstable foundation of philosophy instead of on the solid foundation of mathematics.

This is such a very old idea and you're not the first one to have it. Just try it yourself as an exercise. Is like to see how you get an ought from an is with pure math. Every one who tried to build ethics on math only failed. Please, just google it or read some of the links I shared. Philosophers are totally familiar with very advanced math and use it. Again read some articles on like set theory or quantum mechanics on plato.stanford.edu to verify yourself. It's already being used and always has. Even the antique philosophers were mathematicians. They invented logic and geometry. Every philosophy student through antiquity and the middle ages up to the Renaissance was forced to learn them before getting to the more advanced topics.

No matter how smart you are, other smart people probably had very similar ideas before you, tried to formalize them, got challenged, responded, tried again and so on. The history of their work is the history of philosophy. Trying to do better without even reading any of it would fit the definition of being naive.