feat: screen() 래퍼 추가 + Firefox 프로필 133 업데이트

yf.screen()에 세션 풀 rotation + retry backoff 보호 적용.
firefox102 → firefox133 UA 업데이트.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

yfinance_plus.py

@@ -254,10 +254,10 @@ _BROWSER_PROFILES = [
         "user_agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 12_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Safari/605.1.15",
     },
     {
-        "impersonate": "firefox102",
+        "impersonate": "firefox133",
         "sec_ch_ua": None,  # Firefox doesn't send sec-ch-ua
         "sec_ch_ua_platform": None,
-        "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0",
+        "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0",
     },
     {
         "impersonate": "chrome120",
@@ -637,6 +637,19 @@ def download(tickers: Union[str, list],
     return enhanced_yf._retry_with_backoff(_download)
 
 
+def screen(query, **kwargs):
+    """Enhanced screen() with session pool rotation and retry backoff."""
+    enhanced_yf = _get_global_enhanced_yf()
+
+    def _screen():
+        return yf.screen(query, session=enhanced_yf.session, **kwargs)
+
+    def _on_rate_limit():
+        enhanced_yf._rotate_session_on_ratelimit()
+
+    return enhanced_yf._retry_with_backoff(_screen, on_rate_limit_cb=_on_rate_limit)
+
+
 # Global configuration
 _global_config = RequestConfig()
 
@@ -738,7 +751,7 @@ from yfinance import __version__
 
 # Export main classes and functions for full compatibility
 __all__ = [
-    'Ticker', 'Tickers', 'download', 'set_config', 'get_config',
+    'Ticker', 'Tickers', 'download', 'screen', 'set_config', 'get_config',
     'clear_cache', 'get_cache_info', 'RequestConfig',
     'EnhancedTicker', 'EnhancedTickers', 'EnhancedYFinance', 'HistoricalDataCache'
 ]