Function compose_stack_manifest_v2 

pub fn compose_stack_manifest_v2(
    name: impl Into<String>,
    programs: &[ProgramSpecArtifact],
    live_specs: Vec<(String, &LiveSpecArtifactV2)>,
    selected_views: Vec<SelectedViewV2>,
) -> Result<StackManifestArtifactV2, ArtifactError>

Compose independently authored LiveSpecs without changing the singular semantics of author_stack_v2.