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/is-fullwidth-code-point/index.js

@@ -0,0 +1,50 @@
+/* eslint-disable yoda */
+'use strict';
+
+const isFullwidthCodePoint = codePoint => {
+	if (Number.isNaN(codePoint)) {
+		return false;
+	}
+
+	// Code points are derived from:
+	// http://www.unix.org/Public/UNIDATA/EastAsianWidth.txt
+	if (
+		codePoint >= 0x1100 && (
+			codePoint <= 0x115F || // Hangul Jamo
+			codePoint === 0x2329 || // LEFT-POINTING ANGLE BRACKET
+			codePoint === 0x232A || // RIGHT-POINTING ANGLE BRACKET
+			// CJK Radicals Supplement .. Enclosed CJK Letters and Months
+			(0x2E80 <= codePoint && codePoint <= 0x3247 && codePoint !== 0x303F) ||
+			// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
+			(0x3250 <= codePoint && codePoint <= 0x4DBF) ||
+			// CJK Unified Ideographs .. Yi Radicals
+			(0x4E00 <= codePoint && codePoint <= 0xA4C6) ||
+			// Hangul Jamo Extended-A
+			(0xA960 <= codePoint && codePoint <= 0xA97C) ||
+			// Hangul Syllables
+			(0xAC00 <= codePoint && codePoint <= 0xD7A3) ||
+			// CJK Compatibility Ideographs
+			(0xF900 <= codePoint && codePoint <= 0xFAFF) ||
+			// Vertical Forms
+			(0xFE10 <= codePoint && codePoint <= 0xFE19) ||
+			// CJK Compatibility Forms .. Small Form Variants
+			(0xFE30 <= codePoint && codePoint <= 0xFE6B) ||
+			// Halfwidth and Fullwidth Forms
+			(0xFF01 <= codePoint && codePoint <= 0xFF60) ||
+			(0xFFE0 <= codePoint && codePoint <= 0xFFE6) ||
+			// Kana Supplement
+			(0x1B000 <= codePoint && codePoint <= 0x1B001) ||
+			// Enclosed Ideographic Supplement
+			(0x1F200 <= codePoint && codePoint <= 0x1F251) ||
+			// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
+			(0x20000 <= codePoint && codePoint <= 0x3FFFD)
+		)
+	) {
+		return true;
+	}
+
+	return false;
+};
+
+module.exports = isFullwidthCodePoint;
+module.exports.default = isFullwidthCodePoint;