Increase knowledge graph repulsion — nodes still clustering
First pass wasn't aggressive enough for dense graphs (144 edges / 75
nodes). Increased gravitational repulsion to -30000, weakened spring
constant to 0.01 so repulsion wins over attraction, added avoidOverlap,
and increased stabilization iterations to 500.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>