Interface StructureLoopEdgeAddedEvent

Event payload for StructureRecorder.onLoopEdgeAdded. Fires when .loopTo(target) installs a back-edge. Distinct from onEdgeAdded so consumers can theme back-edges differently and because runtime onLoop carries iteration: number which has no build-time meaning — keeping the events separated avoids forcing an iteration?: number lie into the structural shape.

interface StructureLoopEdgeAddedEvent {
from: string;
to: string;
}