feat: CEF mode for Electrobun E2E — CDP automation, WebGL unlocked

- electrobun.config.ts: AGOR_CEF=1 enables bundleCEF + chromiumFlags
  (remote-debugging-port=9222). Production stays on WebKitGTK.
- wdio.electrobun.conf.js: rewritten for CDP via devtools protocol.
  Spawns app, waits for CDP port, kills on complete.
- helpers/actions.ts: waitForPort() polls CDP /json endpoint
- docs/testing.md: CEF mode docs, CI setup, troubleshooting
- npm script: test:e2e:electrobun prepends AGOR_CEF=1

CEF also enables: WebGL xterm.js addon (unlimited terminals),
WebGPU, full Chrome DevTools — all for dev/test only.

tests/e2e/wdio.electrobun.conf.js

@@ -1,77 +1,119 @@
 /**
  * WebDriverIO config for Electrobun stack E2E tests.
  *
- * Extends shared config with WebKitWebDriver lifecycle and optional
- * PTY daemon management. Port: 9761 (per project convention).
+ * Uses CDP (Chrome DevTools Protocol) via CEF mode for reliable E2E automation.
+ * Electrobun must be built/run with AGOR_CEF=1 to bundle CEF and expose
+ * --remote-debugging-port=9222 (configured in electrobun.config.ts).
+ *
+ * Port conventions:
+ *   9222 — CDP debugging port (CEF)
+ *   9760 — Vite dev server (HMR)
+ *   9761 — (reserved, was WebKitWebDriver)
  */
 
-import { execSync } from 'node:child_process';
+import { execSync, spawn } from 'node:child_process';
 import { resolve, dirname } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { existsSync, rmSync } from 'node:fs';
 import { sharedConfig } from './wdio.shared.conf.js';
+import { waitForPort } from './helpers/actions.ts';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const projectRoot = resolve(__dirname, '../..');
 const electrobunRoot = resolve(projectRoot, 'ui-electrobun');
 
+const CDP_PORT = 9222;
+
 // Use the Electrobun fixture generator (different groups.json format)
 let fixture;
 try {
   const { createTestFixture } = await import('../../ui-electrobun/tests/e2e/fixtures.ts');
-  fixture = createTestFixture('agor-ebun-unified');
+  fixture = createTestFixture('agor-ebun-cdp');
 } catch {
-  // Fall back to the Tauri fixture generator if Electrobun fixtures not available
   const { createTestFixture } = await import('./infra/fixtures.ts');
-  fixture = createTestFixture('agor-ebun-unified');
+  fixture = createTestFixture('agor-ebun-cdp');
 }
 
 process.env.AGOR_TEST = '1';
+process.env.AGOR_CEF = '1';
 process.env.AGOR_TEST_DATA_DIR = fixture.dataDir;
 process.env.AGOR_TEST_CONFIG_DIR = fixture.configDir;
 
-const WEBDRIVER_PORT = 9761;
+console.log(`[electrobun-cdp] Test fixture at ${fixture.rootDir ?? fixture.configDir}`);
 
-console.log(`[electrobun] Test fixture at ${fixture.rootDir ?? fixture.configDir}`);
+let appProcess;
 
 export const config = {
   ...sharedConfig,
 
-  port: WEBDRIVER_PORT,
+  // Use devtools protocol (CDP) instead of WebDriver
+  automationProtocol: 'devtools',
 
   capabilities: [{
-    'wdio:enforceWebDriverClassic': true,
-    browserName: 'webkit',
+    browserName: 'chromium',
+    'goog:chromeOptions': {
+      debuggerAddress: `localhost:${CDP_PORT}`,
+    },
   }],
 
   onPrepare() {
-    // Try multiple binary paths (dev vs canary vs production)
+    // Find existing binary or build
     const candidates = [
       resolve(electrobunRoot, 'build/dev-linux-x64/AgentOrchestrator-dev/AgentOrchestrator-dev'),
       resolve(electrobunRoot, 'build/Agent Orchestrator'),
       resolve(electrobunRoot, 'build/AgentOrchestrator'),
     ];
-    const electrobunBinary = candidates.find(p => existsSync(p));
+    let electrobunBinary = candidates.find(p => existsSync(p));
 
     if (!electrobunBinary && !process.env.SKIP_BUILD) {
-      console.log('Building Electrobun...');
+      console.log('[electrobun-cdp] Building with CEF...');
       try {
         execSync('npx vite build', { cwd: electrobunRoot, stdio: 'inherit' });
-        // electrobun build may not be available — skip if missing
-        try { execSync('electrobun build --env=dev', { cwd: electrobunRoot, stdio: 'inherit' }); } catch {}
+        execSync('electrobun build --env=dev', { cwd: electrobunRoot, stdio: 'inherit' });
       } catch (e) {
-        console.warn('Build failed:', e.message);
+        console.warn('[electrobun-cdp] Build failed:', e.message);
       }
+      electrobunBinary = candidates.find(p => existsSync(p));
     }
 
-    const finalBinary = candidates.find(p => existsSync(p));
-    if (!finalBinary) {
-      console.warn('Electrobun binary not found — tests will use WebKitWebDriver with dev server');
+    if (!electrobunBinary) {
+      // Fall back to `electrobun dev` which builds + launches in one step
+      console.log('[electrobun-cdp] No binary found, launching via electrobun dev...');
+      appProcess = spawn('electrobun', ['dev'], {
+        cwd: electrobunRoot,
+        env: {
+          ...process.env,
+          AGOR_CEF: '1',
+          AGOR_TEST: '1',
+          AGOR_TEST_DATA_DIR: fixture.dataDir,
+          AGOR_TEST_CONFIG_DIR: fixture.configDir,
+        },
+        stdio: 'pipe',
+      });
+    } else {
+      console.log(`[electrobun-cdp] Launching binary: ${electrobunBinary}`);
+      appProcess = spawn(electrobunBinary, [], {
+        env: {
+          ...process.env,
+          AGOR_CEF: '1',
+          AGOR_TEST: '1',
+          AGOR_TEST_DATA_DIR: fixture.dataDir,
+          AGOR_TEST_CONFIG_DIR: fixture.configDir,
+        },
+        stdio: 'pipe',
+      });
     }
+
+    appProcess.stdout?.on('data', (d) => process.stdout.write(`[app] ${d}`));
+    appProcess.stderr?.on('data', (d) => process.stderr.write(`[app] ${d}`));
+    appProcess.on('exit', (code) => console.log(`[electrobun-cdp] App exited with code ${code}`));
+
+    // Wait for CDP port to become available
+    return waitForPort(CDP_PORT, 30_000);
   },
 
   async before() {
-    // Wait for Electrobun app to load
+    // Wait for Electrobun app to render
     await browser.waitUntil(
       async () => {
         const hasEl = await browser.execute(() =>
@@ -83,10 +125,16 @@ export const config = {
       },
       { timeout: 20_000, interval: 500, timeoutMsg: 'Electrobun app did not load in 20s' },
     );
-    console.log('[electrobun] App loaded.');
+    console.log('[electrobun-cdp] App loaded.');
   },
 
-  afterSession() {
+  onComplete() {
+    if (appProcess) {
+      console.log('[electrobun-cdp] Stopping app...');
+      appProcess.kill('SIGTERM');
+      appProcess = undefined;
+    }
+
     const cleanup = fixture.cleanup ?? (() => {
       try {
         if (fixture.rootDir) rmSync(fixture.rootDir, { recursive: true, force: true });