def build_result_cards(ranked_datasets: list[dict], top_n: int = 5) -> list[dict]:
    cards = []
    for i, ds in enumerate(ranked_datasets[:top_n]):
        card = {
            "rank": i + 1,
            "name": ds.get("name", "Unknown"),
            "source": ds.get("source", "Unknown"),
            "relevance_score": ds.get("relevance_score", 0),
            "format": ds.get("format", "N/A"),
            "license": ds.get("license", "N/A"),
            "last_updated": ds.get("last_updated", "N/A"),
            "suitability_notes": ds.get("suitability_notes", ""),
            "url": ds.get("url", ""),
            "active_constraints": ds.get("active_constraints", {})
        }
        cards.append(card)
    return cards