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/pend/index.js

@@ -0,0 +1,55 @@
+module.exports = Pend;
+
+function Pend() {
+  this.pending = 0;
+  this.max = Infinity;
+  this.listeners = [];
+  this.waiting = [];
+  this.error = null;
+}
+
+Pend.prototype.go = function(fn) {
+  if (this.pending < this.max) {
+    pendGo(this, fn);
+  } else {
+    this.waiting.push(fn);
+  }
+};
+
+Pend.prototype.wait = function(cb) {
+  if (this.pending === 0) {
+    cb(this.error);
+  } else {
+    this.listeners.push(cb);
+  }
+};
+
+Pend.prototype.hold = function() {
+  return pendHold(this);
+};
+
+function pendHold(self) {
+  self.pending += 1;
+  var called = false;
+  return onCb;
+  function onCb(err) {
+    if (called) throw new Error("callback called twice");
+    called = true;
+    self.error = self.error || err;
+    self.pending -= 1;
+    if (self.waiting.length > 0 && self.pending < self.max) {
+      pendGo(self, self.waiting.shift());
+    } else if (self.pending === 0) {
+      var listeners = self.listeners;
+      self.listeners = [];
+      listeners.forEach(cbListener);
+    }
+  }
+  function cbListener(listener) {
+    listener(self.error);
+  }
+}
+
+function pendGo(self, fn) {
+  fn(pendHold(self));
+}