feat(extractor): implement multi-engine article content extractor

- Added scripts/extract_article_contents.py for batch scraping with stealth Foxcape and triple extraction (Trafilatura, Newspaper4k, Readability)
- Created unit, integration, and E2E test suite in tests/test_extract_article_contents.py (90/90 passing)
- Updated specs/003-article-content-extractor and README.md with usage documentation and CLI contracts
- Passed ruff linting/formatting and mypy type checking cleanly

scripts/extract_google_news.py

@@ -42,9 +42,7 @@ class SearchQuery:
             raise ValueError("A palavra-chave não pode ser vazia.")
 
         if not self.language or len(self.language.strip()) < 2:
-            raise ValueError(
-                "O idioma deve conter pelo menos 2 caracteres (ex: 'pt', 'en', 'es')."
-            )
+            raise ValueError("O idioma deve conter pelo menos 2 caracteres (ex: 'pt', 'en', 'es').")
 
         if self.max_pages < 1 or self.max_pages > 10:
             raise ValueError("O número máximo de páginas deve estar entre 1 e 10.")
@@ -434,9 +432,7 @@ def main(argv: list[str] | None = None) -> int:
     verbose = not getattr(args, "silent", False)
 
     try:
-        result = extract_google_news(
-            query, resolve_urls=args.resolve_urls, verbose=verbose
-        )
+        result = extract_google_news(query, resolve_urls=args.resolve_urls, verbose=verbose)
         json_output = json.dumps(
             result.to_dict(),
             ensure_ascii=False,