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/tsup.config.ts

@@ -0,0 +1,12 @@
+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+  entry: { index: 'src/index.ts' },
+  format: ['esm'],
+  dts: true,
+  sourcemap: true,
+  splitting: false,
+  treeshake: true,
+  clean: true,
+  external: ['playwright-core', '@playwright/test', 'playwright'],
+});