fix(portable): Correct arch runtime packaging and brew install layout

Download the Node runtime for the requested target architecture instead of\ncopying the host runtime so x64 packaging and universal lipo assembly\nwork reliably from arm64 builders.\n\nInstall portable archive contents at formula prefix to preserve wrapper\nresource-root path resolution during Homebrew installs.\n\nCo-Authored-By: Claude <noreply@anthropic.com>

Author: cameroncooke

scripts/create-homebrew-formula.sh

@@ -67,9 +67,7 @@ class Xcodebuildmcp < Formula
   end
 
   def install
-    libexec.install Dir["*"]
-    bin.install_symlink libexec/"bin/xcodebuildmcp"
-    bin.install_symlink libexec/"bin/xcodebuildmcp-doctor"
+    prefix.install Dir["*"]
   end
 
   test do
@@ -85,4 +83,3 @@ if [[ -n "$OUT_PATH" ]]; then
 else
   printf "%s\n" "$FORMULA_CONTENT"
 fi
-

scripts/package-macos-portable.sh

@@ -115,6 +115,45 @@ verify_axe_assets() {
   fi
 }
 
+install_node_runtime_for_arch() {
+  local target_arch="$1"
+  local output_path="$2"
+  local node_version="${NODE_RUNTIME_VERSION:-$(node -p "process.versions.node")}"
+  local node_arch=""
+
+  case "$target_arch" in
+    arm64)
+      node_arch="arm64"
+      ;;
+    x64)
+      node_arch="x64"
+      ;;
+    *)
+      echo "Unsupported target arch for Node runtime: $target_arch"
+      exit 1
+      ;;
+  esac
+
+  local archive_name="node-v${node_version}-darwin-${node_arch}.tar.gz"
+  local download_url="https://nodejs.org/dist/v${node_version}/${archive_name}"
+  local temp_dir
+  temp_dir="$(mktemp -d)"
+
+  curl -fLsS "$download_url" -o "$temp_dir/$archive_name"
+  tar -xzf "$temp_dir/$archive_name" -C "$temp_dir"
+
+  local extracted_node="$temp_dir/node-v${node_version}-darwin-${node_arch}/bin/node"
+  if [[ ! -x "$extracted_node" ]]; then
+    echo "Failed to locate extracted Node runtime at $extracted_node"
+    rm -r "$temp_dir"
+    exit 1
+  fi
+
+  cp "$extracted_node" "$output_path"
+  chmod +x "$output_path"
+  rm -r "$temp_dir"
+}
+
 write_wrapper_scripts() {
   local root="$1"
   local bin_dir="$root/bin"
@@ -223,8 +262,7 @@ if [[ -d "$PORTABLE_ROOT" ]]; then
 fi
 mkdir -p "$PORTABLE_ROOT/bin" "$PORTABLE_ROOT/libexec"
 
-cp "$(command -v node)" "$PORTABLE_ROOT/libexec/node-runtime"
-chmod +x "$PORTABLE_ROOT/libexec/node-runtime"
+install_node_runtime_for_arch "$ARCH" "$PORTABLE_ROOT/libexec/node-runtime"
 
 cp -R "$PROJECT_ROOT/build" "$PORTABLE_ROOT/libexec/"
 cp -R "$PROJECT_ROOT/manifests" "$PORTABLE_ROOT/libexec/"