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/devtools-protocol/pdl/domains/PerformanceTimeline.pdl

@@ -0,0 +1,71 @@
+# Copyright 2017 The Chromium Authors
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Contributing to Chrome DevTools Protocol: https://goo.gle/devtools-contribution-guide-cdp
+
+# Reporting of performance timeline events, as specified in
+# https://w3c.github.io/performance-timeline/#dom-performanceobserver.
+experimental domain PerformanceTimeline
+  depends on DOM
+  depends on Network
+
+  # See https://github.com/WICG/LargestContentfulPaint and largest_contentful_paint.idl
+  type LargestContentfulPaint extends object
+    properties
+      Network.TimeSinceEpoch renderTime
+      Network.TimeSinceEpoch loadTime
+      # The number of pixels being painted.
+      number size
+      # The id attribute of the element, if available.
+      optional string elementId
+      # The URL of the image (may be trimmed).
+      optional string url
+      optional DOM.BackendNodeId nodeId
+
+  type LayoutShiftAttribution extends object
+    properties
+      DOM.Rect previousRect
+      DOM.Rect currentRect
+      optional DOM.BackendNodeId nodeId
+
+  # See https://wicg.github.io/layout-instability/#sec-layout-shift and layout_shift.idl
+  type LayoutShift extends object
+    properties
+      # Score increment produced by this event.
+      number value
+      boolean hadRecentInput
+      Network.TimeSinceEpoch lastInputTime
+      array of LayoutShiftAttribution sources
+
+  type TimelineEvent extends object
+    properties
+      # Identifies the frame that this event is related to. Empty for non-frame targets.
+      Page.FrameId frameId
+      # The event type, as specified in https://w3c.github.io/performance-timeline/#dom-performanceentry-entrytype
+      # This determines which of the optional "details" fields is present.
+      string type
+      # Name may be empty depending on the type.
+      string name
+      # Time in seconds since Epoch, monotonically increasing within document lifetime.
+      Network.TimeSinceEpoch time
+      # Event duration, if applicable.
+      optional number duration
+      optional LargestContentfulPaint lcpDetails
+      optional LayoutShift layoutShiftDetails
+
+  # Previously buffered events would be reported before method returns.
+  # See also: timelineEventAdded
+  command enable
+    parameters
+      # The types of event to report, as specified in
+      # https://w3c.github.io/performance-timeline/#dom-performanceentry-entrytype
+      # The specified filter overrides any previous filters, passing empty
+      # filter disables recording.
+      # Note that not all types exposed to the web platform are currently supported.
+      array of string eventTypes
+
+  # Sent when a performance timeline event is added. See reportPerformanceTimeline method.
+  event timelineEventAdded
+    parameters
+      TimelineEvent event