Every spacing constant was tuned against a snapshot and silently broke when content changed. The layout now derives all distances from the content, so overlap is impossible by construction.
Node size is a radius in graph units, not pixels — it had been inflated until a node's radius equalled the distance to its parent. Fixing it exposed that the roots never had an angular budget.
Sibling directories were seeded at byte-identical coordinates. Both gwells seeders now give each subtree an angular budget, so sibling overlap is impossible by construction.