Agreeing with everyone here. He has definitely overstepped the line and he is not acting like a true CTO. Part of his job is to ensure he instills a high level of trust and support with the team in addition to the rest of his role. Assuming you're an overall good guy, he should do what he can to ensure you stay as part of the company you helped build, be it bad code or not. And if things are not working out, at least provide the path of what you need to do to make it better as the clause. But either way, it sounds like he's just being an ass with an ego.
1. HTTP Request Builder (i.e. Postman) 2. Web Proxy 3. Make the Web IDE for anything like Atom or SublimeText 4. CSS media emulation
The release looks great, congratulation guys. Looking forward to the future of this model.