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/build/lib/yerror.js

@@ -0,0 +1,9 @@
+export class YError extends Error {
+    constructor(msg) {
+        super(msg || 'yargs error');
+        this.name = 'YError';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, YError);
+        }
+    }
+}