Function compose_for_conformance 

pub fn compose_for_conformance(
    base_profile: HashMap<String, CapabilityEntry>,
    providers: &[ProviderFragment],
    target_id: TargetId,
) -> Result<Vec<String>, DispatchError>

Compose against an empty tool map and report only the capability keys — the shape the shared conformance fixture asserts. Exposed for that suite rather than for the emit path, which needs the whole composed target and reaches compose_target directly.