pub fn graph_expand(ctx: &Context, seed_ids: &[String]) -> Vec<String>Expand description
Expand the graph neighborhood of seed symbols found by FTS/semantic search.
Takes symbol IDs from the top search results and queries FalkorDB for their callees (what they call) and callers (who calls them). Callees are ranked first since they represent implementation details more useful for conceptual queries. Returns deduplicated symbol IDs for use as an RRF source.