Add visual snapshot for A03 terminal layer repro

[seveibar]

Summary\n\n- add the reduced A03 node extracted from the Pipeline9 Arduino reroute failure\n- render the input ports on the left and the original, unfixed A03 output on the right\n- draw the node boundary in both panels and snapshot the comparison via visualize() and toMatchSvgSnapshot\n- intentionally preserve the current output so the fix in #89 has a clear visual before/after diff\n\n## What to look for\n\nThe left panel makes the input geometry explicit: 8 of 18 ports lie on the node boundary and 10 are interior. Interior endpoints are valid regional-repair inputs; A03 maps arbitrary endpoint coordinates into its grid.\n\nThe defect is visible in the right panel: the route from the red endpoint near the middle-left travels on the blue layer, then changes to the red layer laterally at the endpoint. There is no gray via marker at that transition. The gray via farther to the right is the earlier valid layer change.\n\n## Test plan\n\n- BUN_UPDATE_SNAPSHOTS=1 bun test --timeout 9999999\n- bun run build\n- bunx tsc --noEmit\n- bun run format:check\n- git diff --check

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Project	Deployment	Actions	Updated (UTC)
high-density-a01	Ready	Preview	Aug 23, 2026 9:24pm