Add 5 mm trace turn-density quality report

[seveibar]

Problem

Dense DDR fanouts can pass electrical validation while containing many small bends that look chaotic. Existing benchmark artifacts show route completion but do not quantify or surface these traces.

Changes

• Measure each trace's maximum completed 90 degree turns in any 5 mm centerline window. Consecutive turns in opposite directions cancel, so a +45 degree turn followed by a -45 degree turn scores zero.
• Add public measurement, summary, and threshold-check APIs, with vias, jumpers, and layer transitions starting new continuous sections.
• Record all-trace and signal-only medians in benchmark results and markdown.
• Generate trace-turn-density.svg from the four solved fanout samples with the highest maximum score, embedding each sample's native FanoutSolver.visualize() output.
• Generate compact per-trace JSON with sample and trace provenance.

Validation

• bun run typecheck
• bun test tests/trace-turn-density.test.ts tests/trace-turn-density-svg.test.ts tests/benchmark-validation.test.ts
• bun test tests/benchmark-cli.test.ts
• Measured all 40 solved samples in this branch's 72-case dataset. The selected K230 boards reached a maximum score of 72 and signal-trace medians from 43 to 63.

[vercel]

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Project	Deployment	Actions	Updated
fanout-solver	Ready	Preview	Sep 8, 2026 3:01am UTC