Function render_chunked 

pub fn render_chunked(clusters: &[FactCluster<'_>]) -> String

Render clusters in the compact wakeup notation: one line per chunk, [topic] key=val|key=val. Facts whose category equals the topic drop the category prefix entirely (the header amortizes it) — that is where the token savings over the flat cat/key=val|cat/key=val list come from.