feat: combine close same-net trace segments

[jarnodevries-byte]

Summary

• Adds a conservative SameNetTraceSegmentCombinationSolver phase after trace overlap shifting.
• Combines a short internal same-net segment onto a nearby containing same-net segment when doing so preserves orthogonal routing and does not introduce different-net intersections.
• Feeds the combined traces into later net-label placement and overlap-avoidance phases.

Test plan

• npm exec -- tsup-node lib/index.ts --format esm --dts
• npm exec --yes --package bun -- bun test tests/solvers/SameNetTraceSegmentCombinationSolver/same-net-trace-segment-combination-solver.test.ts
• npm exec --yes --package bun -- bun test

/claim #29

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 24, 2026 7:04pm