jpmschweitzerandClaude Opus 4.8
718d2b39c2
Collect <marker> defs (refX/refY, orient=auto, markerUnits) and the path marker-start/mid/end refs in the builder, then paint them at the path endpoints rotated to the path tangent (orient=auto). The viewBox→viewport scale is approximated 1:1 (holds for d2's markers). d2 edges now render with arrowheads. Covered by dart test (builder) + a flutter-test pixel probe (the green arrowhead draws). image painting remains the last T-320 follow-on. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>