feat: ship verified platform upgrade bundles with production dependencies

scripts/build-bundle-installer.cjs

@@ -0,0 +1,22 @@
+const path = require('node:path');
+require('../cli/node_modules/esbuild').buildSync({
+  entryPoints: [path.resolve(__dirname, '../shell/install-bundle.cjs')],
+  outfile: path.resolve(process.argv[2] || 'output/upgrade/install-bundle.cjs'),
+  bundle: true,
+  platform: 'node',
+  format: 'cjs',
+  target: 'node20',
+  minify: true,
+  legalComments: 'inline',
+});
+const { spawnSync } = require('node:child_process');
+const result = spawnSync(
+  process.execPath,
+  [path.resolve(process.argv[2] || 'output/upgrade/install-bundle.cjs')],
+  { encoding: 'utf8' },
+);
+if (
+  result.status !== 1 ||
+  !result.stderr.includes('Usage: node install-bundle.cjs')
+)
+  throw new Error('Standalone offline installer did not start correctly');