Function edge_confidence 

pub fn edge_confidence(kind: &str, weight: f64) -> f64

Confidence that an edge represents a real relationship, in 0.0..=1.0.

Explicit code references (import/reexport) are certain; structural module grouping is fairly reliable; the co-location/co-change heuristics are weaker and scale with their observed weight (e.g. how often two files changed together). The dashboard styles edges by this score so heuristic links read as faint/dashed while real dependencies stay solid (#273).