Add macOS x86_64 platform support

Platform detection now happens in framework/platform, sourced by both
sync.sh and the node shim. Uses shasum on macOS, sha256sum on Linux.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

framework/platform

@@ -0,0 +1,26 @@
+# shellcheck shell=bash
+
+# Detect platform (OS and architecture)
+
+os=$(uname -s | tr '[:upper:]' '[:lower:]')
+arch=$(uname -m)
+
+case "$os" in
+    linux) platform_os=linux ;;
+    darwin) platform_os=darwin ;;
+    *) echo "Unsupported OS: $os" >&2; exit 1 ;;
+esac
+
+case "$arch" in
+    x86_64) platform_arch=x86_64 ;;
+    *) echo "Unsupported architecture: $arch" >&2; exit 1 ;;
+esac
+
+platform="${platform_os}_${platform_arch}"
+
+# Platform-specific checksum command
+if [ "$platform_os" = "darwin" ]; then
+    sha256_check() { shasum -a 256 -c -; }
+else
+    sha256_check() { sha256sum -c -; }
+fi

framework/shims/node.common

@@ -7,6 +7,15 @@ project_root="$node_common_DIR/../.."
 # shellcheck source=../versions
 source "$node_common_DIR"/../versions
 
+# shellcheck source=../platform
+source "$node_common_DIR"/../platform
+
+# Get platform-specific node directory
+nodejs_dirname_var="nodejs_dirname_${platform}"
+nodejs_dirname="${!nodejs_dirname_var}"
+nodejs_dist_dir="framework/binaries/$nodejs_dirname"
+nodejs_bin_dir="$nodejs_dist_dir/bin"
+
 nodejs_binary_dir="$project_root/$nodejs_bin_dir"
 
 # This might be too restrictive.  Or not restrictive enough.

framework/versions

@@ -2,18 +2,25 @@
 
 # This file belongs to the framework.  You are not expected to modify it.
 
+nodejs_version=v24.12.0
+
 # https://nodejs.org/dist
 nodejs_binary_linux_x86_64=https://nodejs.org/dist/v24.12.0/node-v24.12.0-linux-x64.tar.xz
 nodejs_checksum_linux_x86_64=bdebee276e58d0ef5448f3d5ac12c67daa963dd5e0a9bb621a53d1cefbc852fd
-nodejs_dist_dir=framework/binaries/node-v22.15.1-linux-x64
-nodejs_bin_dir="$nodejs_dist_dir/bin"
+nodejs_dirname_linux_x86_64=node-v24.12.0-linux-x64
+
+nodejs_binary_darwin_x86_64=https://nodejs.org/dist/v24.12.0/node-v24.12.0-darwin-x64.tar.xz
+nodejs_checksum_darwin_x86_64=1e4d54f706e0a3613d6415ffe2ccdfd4095d3483971dbbaa4ff909fac5fc211c
+nodejs_dirname_darwin_x86_64=node-v24.12.0-darwin-x64
 
 caddy_binary_linux_x86_64=fixme
 caddy_checksum_linux_x86_64=fixmetoo
 
 # https://github.com/pnpm/pnpm/releases
 pnpm_binary_linux_x86_64=https://github.com/pnpm/pnpm/releases/download/v10.28.0/pnpm-linux-x64
-pnpm_checksum_linux_x86_64=sha256:348e863d17a62411a65f900e8d91395acabae9e9237653ccc3c36cb385965f28
+pnpm_checksum_linux_x86_64=348e863d17a62411a65f900e8d91395acabae9e9237653ccc3c36cb385965f28
 
+pnpm_binary_darwin_x86_64=https://github.com/pnpm/pnpm/releases/download/v10.28.0/pnpm-macos-x64
+pnpm_checksum_darwin_x86_64=99431e91d721169c2050d5e46abefc6f0d23c49e635a5964dcb573d9fe89975a
 
 golangci_lint=v2.7.2-alpine