Function declared_for 

pub fn declared_for(
    decl: &FamilyPipelines,
    points: &[(&Values, &ByOp)],
    group: &[KernelId],
    site: &Site<'_>,
    point: &Values,
) -> Result<NodePipeline, String>

2026-10-02: The pipeline a family declares for the node at site, run by group (the plan group’s kernels), at the node’s point point (the values it carries) among points (each point’s values and own declarations).