def extract_context_signals(article: dict, mention_span: tuple) -> dict:
    window = article["text"][max(0, mention_span[0]-200):mention_span[1]+200]
    return {
        "mentioned_with": extract_entity_mentions(window),
        "sector_keywords": extract_sector_terms(window),
        "article_category": article.get("category", "unknown"),
    }