xtool

1. Scope+branch

1. READ current overview + host install guide.
2. RECORD host/arch/goal/device/account mode/current Swift-Xcode-xtool exact versions; inspect xtool --help + xtool help SUBCOMMAND.
3. Linux|WSL -> READ references/linux-wsl.md. macOS -> READ references/macos.md. Native Windows => WSL+USB passthrough.
4. Linux: prefer official Swift.org/Swiftly; matching version string insufficient.

2. Preflight

python3 scripts/check-environment.py --min-swift CURRENT_REQUIRED

Add as needed: --xcode-xip PATH; --require-device-tools. Resolve missing executable/host/version first. Linux Swift under /usr => warning; later xtool dev build required.

3. Install+setup