Interaction graph
Drag the background to pan and the wheel to zoom; double-click or f fits the whole graph. Drag a node to move it — it stays where you put it until you unpin. Hover a node or an edge for what it is and what the edge was read from. Click to focus; shift-click two parts to trace the shortest path between them.
Structure is laid out by the graph itself, not by anything declared: parts that all reach each other are grouped into a ring, and between rings every edge points one way down the page, so cycles are exactly and only what stays inside a ring. Disc area tracks the size of a package’s public API; stroke weight tracks how many times one part names another. Toggle an edge kind to recompute the whole structure without it.