Add conservative same-net trace segment merge phase

[iyop666]

Summary

• add a conservative SameNetTraceSegmentMergeSolver phase after trace cleanup
• snap only close, overlapping, parallel segments that share the same globalConnNetId
• preserve terminal pin segments so component endpoints are not moved
• feed the merged trace output into the final net-label placement and downstream phases

Safety

The merge is intentionally narrow: segments must be same-net, same orientation, within the merge distance, and overlap most of the shorter run. Different nets, terminal-only pin segments, and small partial overlaps are left unchanged.

Verification

• npx --yes bun test tests/solvers/SameNetTraceSegmentMergeSolver/same-net-trace-segment-merge-solver.test.ts tests/examples/example29.test.ts tests/examples/example30.test.ts tests/examples/example34.test.ts
• npx --yes -p typescript@5.9.3 tsc --noEmit --pretty false
• npm run build

Closes #29
/claim #29

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 23, 2026 10:49pm