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/zod/v3/helpers/errorUtil.d.cts

@@ -0,0 +1,9 @@
+export declare namespace errorUtil {
+    type ErrMessage = string | {
+        message?: string | undefined;
+    };
+    const errToObj: (message?: ErrMessage) => {
+        message?: string | undefined;
+    };
+    const toString: (message?: ErrMessage) => string | undefined;
+}