Add Electron E2E harness launcher

scripts/run-electron-harness.cjs

@@ -0,0 +1,21 @@
+const { spawnSync } = require('node:child_process')
+
+const electron = require('electron')
+const args = process.argv.slice(2)
+
+if (!args.length) {
+  console.error('usage: node scripts/run-electron-harness.cjs <script> [args...]')
+  process.exit(2)
+}
+
+const env = { ...process.env }
+delete env.ELECTRON_RUN_AS_NODE
+env.ELECTRON_DISABLE_SANDBOX = '1'
+
+const res = spawnSync(electron, ['--no-sandbox', ...args], {
+  stdio: 'inherit',
+  env,
+  argv0: electron,
+})
+
+process.exit(res.status ?? 1)