def search(
    query: str,
    signature_status: Literal["Signed", "Unsigned", "Partially Signed"] | None = None,
    project: Literal["Project Alpha", "Project Beta", "General Services"] | None = None,
    document_type: Literal["contract", "amendment", "renewal"] | None = None,
    n_results: int = 10
) -> dict:
    """
    Search legal contracts with AI-extracted faceted filtering.

    Args:
        query: Natural language search query
        signature_status: Filter by signing status
        project: Filter by project classification
        document_type: Filter by document type
        n_results: Number of contracts to return

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