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/bare-fs/lib/errors.d.ts

@@ -0,0 +1,11 @@
+declare class FileError extends Error {
+  private constructor(msg: string)
+
+  readonly code: string
+  readonly operation?: string
+  readonly path?: string
+  readonly destination?: string
+  readonly fd?: number
+}
+
+export = FileError