Restore darwin-x64 prebuild on macos-14 macos-14 is Apple Silicon (arm64); the previous arm64 cross-compile step was redundant. Switch it to x64 — macOS/Xcode supports arm64↔x64 cross-compilation natively, so no extra tooling needed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>