@zatnosk Depends on what you mean.
Can you build a game system based entirely on non-combat mechanics that still carries core TTRPG design concepts, that will continue being pacifist when running other people's campaigns (so to speak)? Definitely.
Can you build a pacifist open sourced game framework where people can't write their own combat mechanics into the codebase in their implementation? No, of course not, you can't control other people's server code.