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

.gitignore

@@ -37,6 +37,10 @@ htmlcov/
 CLAUDE.md
 .claude/
 
+# JavaScript / Node.js
+js/node_modules/
+js/dist/
+
 # Distribution
 *.tar.gz
 *.whl
@@ -48,4 +52,5 @@ docs/
 
 # Release scripts
 publish.sh
+deploy.sh
 .env