No networking inside forks? This is not usable.

Not yet. Current design is run code, return result. Adding virtio-net to forks is on the roadmap. What's your use case that needs it?

BranchFS is a FUSE-based filesystem that enables speculative branching on top of any existing filesystem. It gives AI agents isolated workspaces with instant copy-on-write branching, atomic commit-to-root, and zero-cost abort, no root privileges required.