Agent instruction:

BPMN vocabulary — an edge's meaning comes from its type plus the node types it connects, not from any role tag: `flows_to` is process order and renders source -> target with no reversal; a `has_parent` edge from a flow node to a process Action places it in that process's pool (and makes the parent Action a process, or a subprocess if it has a parent of its own); an `attributed_to` edge to a Principal drives actor lanes (from an Action), gateway deciders (from a Decision), and process ownership (from the process Action); a `constrained_by` edge to a Rule links a policy guard; a `supports` edge from an Eval tests the node it points at, and `supports` edges from other nodes carry rationale and evidence.