Xcode Cloud CI now installs Rust + Node + pnpm

Spent an hour fighting Xcode Cloud CI for the Cruiser+ iOS build. The runner has Xcode and Homebrew but does not have Rust, Node, or pnpm preinstalled — and the default ci_post_clone.sh doesn't get them. Fixed with a tiny shell script that installs all three from scratch on every cold start (~90s overhead, acceptable). Lesson: Xcode Cloud is fine for pure-Swift projects. For anything Tauri / iroh…