Add automatic diagram layout via ELK.js running in a dedicated Web Worker.
Nodes animate smoothly (200ms ease-out) to computed positions using the
Sugiyama/layered algorithm. Includes layout direction controls (DOWN/RIGHT/
LEFT/UP), edge routing modes (orthogonal/splines/polyline), 200-node soft
cap warning, single-flight race condition protection, and 10s worker timeout.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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