Function run_centrality 

pub fn run_centrality(
    db: &FactsDb,
    opts: &Options,
) -> Result<Vec<CentralityRow>>

Compute the four centrality scores per file on the Fisher-significant coupling graph.

Errors

Returns [CodeLoreError::Analysis] if the underlying coupling query fails. An empty coupling result (small repos, threshold filtered everything out) yields an empty Vec — not an error.