Function task_surface 

pub fn task_surface(
    compiler: &ContextCompiler<'_>,
    goal: &str,
    budget_tokens: usize,
    explain: bool,
    semantic: Option<&dyn SemanticScorer>,
) -> String

Task-personalized surface map (full map, no novelty filter — this is a map, not a delta): entries re-ranked by task PPR + importance via the one authoritative build_surface service in Task mode.