feat: Playwright 三Agent应用 — Generator→Planner→Healer 完整流水线

三Agent流程:
1. Generator: codegen 录制操作生成测试代码草稿
2. Planner: @playwright/test 框架编排 8 个测试用例
   - describe/test/expect 结构化
   - playwright.config.ts 并行执行 + HTML 报告
3. Healer: trace + retries + screenshot 自动修复
   - 失败自动重试 2 次
   - 首次重试时保存 trace.zip
   - 生成 playwright-report/ 可视化报告

测试结果: 8/8 passed (23秒)
产物: test-results/ 含 trace.zip, playwright-report/ HTML报告

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

playwright.config.ts

@@ -0,0 +1,38 @@
+import { defineConfig, devices } from '@playwright/test';
+
+/**
+ * Playwright 配置 — 三 Agent 集成
+ * Planner: 测试结构 + 并行执行 + HTML 报告
+ * Healer: 自动重试 + Trace 快照
+ * Generator: 通过 codegen 命令配合使用
+ */
+export default defineConfig({
+  testDir: './tests',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 1,     // ← Healer: 失败自动重试
+  workers: process.env.CI ? 1 : 3,     // ← Planner: 并行执行
+  reporter: [
+    ['html', { outputFolder: 'playwright-report' }],  // ← Planner: HTML 报告
+    ['list'],                                          // ← Planner: 控制台实时输出
+  ],
+
+  // ← Healer: 失败时保存 Trace 和截图
+  trace: 'on-first-retry',
+  screenshot: 'only-on-failure',
+  video: 'on-first-retry',
+
+  timeout: 120000,         // 单测超时 2 分钟
+  expect: { timeout: 10000 },
+
+  use: {
+    baseURL: 'http://localhost:13001',
+    headless: true,
+    viewport: { width: 1440, height: 900 },
+    ignoreHTTPSErrors: true,
+  },
+
+  projects: [
+    { name: 'chromium', use: { ...devices['Desktop Chrome'] } },
+  ],
+});