Function context_query 

pub fn context_query(
    g: &ServeGraph,
    query: &str,
    dense: Option<(&StaticEmbedder, &HashMap<String, Vec<f32>>)>,
) -> ContextResult

Exact-symbol lookup + 1-hop call-graph expansion.

Returns matched entry points with their callers and callees (via calls edges only). Falls back to semantic search if no exact label match is found.