Reproduce USB-C flashlight runaway ground trace

[seveibar]

Summary

• reproduce the tscircuit/core USB-C flashlight routing regression with the captured four-component solver geometry
• record the current runaway ground route in a full pipeline SVG snapshot
• assert the current behavior: one long-distance trace and one label for the downward-constrained connection

Reproduction details

The fixture includes the USB-C connector, LED, resistor, switch, both three-pin power rails, label orientations, text obstacles, and the same maxMspPairDistance emitted by core.

Its identifiers are deliberately opaque. The test locates the affected connection using its existing downward-only label orientation, not identifier text or added ground metadata.

This PR intentionally contains no solver fix. The fix is provided in a second PR stacked on this reproduction.

Verification

• bun test — 182 passed, 4 skipped
• bunx tsc --noEmit
• bun run format:check
• headless pipeline render inspected
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview	Aug 15, 2026 6:57pm