Add Brave CDP automation, replace Oracle browser mode

Connects to user's running Brave via Chrome DevTools Protocol
to automate ChatGPT interaction. Uses puppeteer-core to open a
tab, send the prompt, wait for response, and extract the result.

No cookies, no separate profiles, no copy/paste. Just connects
to the browser where the user is already logged in.

One-time setup: relaunch Brave with --remote-debugging-port=9222

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/yargs/browser.mjs

@@ -0,0 +1,7 @@
+// Bootstrap yargs for browser:
+import browserPlatformShim from './lib/platform-shims/browser.mjs';
+import {YargsFactory} from './build/lib/yargs-factory.js';
+
+const Yargs = YargsFactory(browserPlatformShim);
+
+export default Yargs;