Backend:
- Set POLYLINE edge routing on ELK root — eliminates curved/bent edges
between horizontally aligned nodes
- Collect edges from handler section roots (not just main root) so
internal handler edges are included in the layout output
- Use correct root reference for coordinate calculation per edge
Frontend:
- Render ALL edge points as line segments (polylines), not cubic bezier.
ELK bend points are waypoints, not bezier control points — the cubic
bezier interpretation caused false curves.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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