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/basic-ftp/dist/StringWriter.d.ts

@@ -0,0 +1,7 @@
+import { Writable } from "stream";
+import { StringEncoding } from "./StringEncoding";
+export declare class StringWriter extends Writable {
+    protected buf: Buffer<ArrayBuffer>;
+    _write(chunk: Buffer | string | any, _: string, callback: (error: Error | null) => void): void;
+    getText(encoding: StringEncoding): string;
+}