Add Node/TS automation twin sharing the extension core.

Expose ExtractorSession for Playwright/camoufox-js so Node automations can
import context dumps instead of shelling out to the Python package. Same
fixture as the Python tests; wired into Makefile and Gitea CI.

automation-js/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    include: ['tests/**/*.test.ts'],
+    testTimeout: 20_000,
+  },
+});