DAGassist               Generate and/or export report that classifies
                        nodes, compares models, and (optionally) target
                        causal estimands.
bad_controls_in         flag bad controls (mediator/collider/desc of Y)
                        among a candidate set
classify_nodes          Classify DAG nodes
print.DAGassist_report
                        Print method for DAGassist reports
print.DAGassist_roles   Print node classifications (aligned)
print.DAGassist_validation
                        Minimal, clean printout for validation results
                        with color coding
