Build Expo/React Native apps in ephemeral Tart VMs on a remote Mac — from any OS (Windows, macOS, or Linux), over SSH. Every build gets a fresh macOS VM clone with Xcode and all dependencies pre-installed. No dependency drift, no stale caches, no Homebrew conflicts. When the build finishes, the VM is deleted. Also supports EAS Cloud builds, store submission, OTA updates, and local device installs — through one CLI.