brew install xcodegen resolves to a formula requiring Xcode 15.3, which
cannot be installed on the macOS 12 runner (Xcode 14.2), failing run
31390 before project generation. Install a pinned prebuilt XcodeGen
2.38.0 release via scripts/ensure-host-tools.sh, shared by the
build-and-test and package jobs (package-release.sh also runs xcodegen).
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>