Agent instruction:

Relationships in a process Doco are first-class edges with lifecycle and history. Use `flows_to` for process order and the canonical families (`supports`, `attributed_to`, `constrained_by`, `has_parent`, `derived_from`, `replaces`, `relates_to`); an edge's specialized meaning comes from its type plus the node types it connects, not from a role tag. Re-point by retiring the old edge and adding the new one; endpoints are immutable.