fix: 修复 OpenCode 运行时启动与本地打包

tests/unit/playwright-mcp.test.ts

@@ -0,0 +1,10 @@
+import { describe, expect, it } from 'vitest';
+import { resolvePlaywrightMcpServer } from '@electron/opencode/playwright-mcp';
+
+describe('Playwright MCP runtime resolution', () => {
+  it('fails closed instead of falling back to npx when the local package is missing', () => {
+    expect(() => resolvePlaywrightMcpServer(() => {
+      throw new Error('missing package');
+    })).toThrow('Bundled @playwright/mcp is missing');
+  });
+});