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)

scripts/verify-desktop-render.cjs

@@ -1,5 +1,5 @@
 // Runs the desktop-render verification harnesses (Phase A/B of
-// electron-rendering-integration-plan_2.md) under Electron and aggregates the
+// 05_electron-rendering-integration-plan_2.md) under Electron and aggregates the
 // results. Each harness exits 0 on PASS, non-zero on FAIL.
 //
 //   npm run test:render-desktop   (compiles electron TS first, then runs this)
@@ -11,6 +11,10 @@ const { spawnSync } = require('node:child_process')
 const path = require('node:path')
 
 const electron = require('electron') // resolves to the electron binary path
+const electronEnv = { ...process.env }
+delete electronEnv.ELECTRON_RUN_AS_NODE
+electronEnv.ELECTRON_DISABLE_SANDBOX = '1'
+
 const harnesses = [
   ['capture', 'verify-capture.cjs', 'hidden-window capturePage produces advancing, non-blank frames (#1/#2)'],
   ['capture-fidelity', 'verify-capture-fidelity.cjs', 'capturePage matches render.html canvas pixels'],
@@ -26,8 +30,9 @@ const harnesses = [
 let failures = 0
 for (const [name, file, desc] of harnesses) {
   process.stdout.write(`\n=== ${name}: ${desc} ===\n`)
-  const res = spawnSync(electron, [path.join(__dirname, file)], {
+  const res = spawnSync(electron, ['--no-sandbox', path.join(__dirname, file)], {
     stdio: ['ignore', 'inherit', 'ignore'], // drop Electron's chatty stderr
+    env: electronEnv,
   })
   if (res.status !== 0) {
     failures += 1