def search(
    query: str,
    source: str = None,
    document_type: str = None,
    freshness_score_min: float = None,
    n_chunks: int = 10
) -> dict:
    """
    Semantic search that automatically returns results with facet information.

    Args:
        query: Natural language search query
        source: Optional filter by document source (aligns with source_facet)
        document_type: Optional filter by document category
        freshness_score_min: Optional minimum freshness score
        n_chunks: Number of chunks to return (default: 10)

    Returns:
        Dict with chunks, facets, and system instructions
    """
    pass