feat: add JavaScript/TypeScript wrapper with Playwright + Puppeteer support

Adds js/ package mirroring the Python wrapper architecture:
- Dual API: import from 'cloakbrowser' (Playwright) or 'cloakbrowser/puppeteer'
- TypeScript with full type definitions
- Same binary download/cache logic, same stealth args, same env vars
- Optional peer deps: users install only the runtime they need
- Full 6-site stealth test suite (sannysoft, incolumitas, BrowserScan, deviceandbrowserinfo, FingerprintJS, reCAPTCHA v3)
- Published to npm as cloakbrowser@0.1.2

js/src/puppeteer.ts

@@ -0,0 +1,59 @@
+/**
+ * Puppeteer launch wrapper for cloakbrowser.
+ * Alternative to the Playwright wrapper for users who prefer Puppeteer.
+ */
+
+import type { Browser } from "puppeteer-core";
+import type { LaunchOptions } from "./types.js";
+import { getDefaultStealthArgs } from "./config.js";
+import { ensureBinary } from "./download.js";
+
+/**
+ * Launch stealth Chromium browser via Puppeteer.
+ *
+ * @example
+ * ```ts
+ * import { launch } from 'cloakbrowser/puppeteer';
+ * const browser = await launch();
+ * const page = await browser.newPage();
+ * await page.goto('https://bot.incolumitas.com');
+ * console.log(await page.title());
+ * await browser.close();
+ * ```
+ */
+export async function launch(options: LaunchOptions = {}): Promise<Browser> {
+  const puppeteer = await import("puppeteer-core");
+
+  const binaryPath = process.env.CLOAKBROWSER_BINARY_PATH || (await ensureBinary());
+  const args = buildArgs(options);
+
+  // Puppeteer handles proxy via CLI args, not a separate option
+  if (options.proxy) {
+    args.push(`--proxy-server=${options.proxy}`);
+  }
+
+  const browser = await puppeteer.default.launch({
+    executablePath: binaryPath,
+    headless: options.headless ?? true,
+    args,
+    ignoreDefaultArgs: ["--enable-automation"],
+    ...options.launchOptions,
+  });
+
+  return browser;
+}
+
+// ---------------------------------------------------------------------------
+// Internal
+// ---------------------------------------------------------------------------
+
+function buildArgs(options: LaunchOptions): string[] {
+  const args: string[] = [];
+  if (options.stealthArgs !== false) {
+    args.push(...getDefaultStealthArgs());
+  }
+  if (options.args) {
+    args.push(...options.args);
+  }
+  return args;
+}