feat: add SameNetTraceMergeSolver to merge close same-net trace segments

[drmabus]

Closes #29

Adds SameNetTraceMergeSolver to merge close same-net trace segments.

Changes

• Introduced SameNetTraceMergeSolver
• Groups traces by globalConnNetId
• Merges close parallel overlapping segments
• Simplifies paths using simplifyPath
• Inserted into pipeline after traceOverlapShiftSolver and before netLabelPlacementSolver

Why
Improves routing cleanliness and reduces redundant trace segments in the solver output.

Validation

• npm run build
• npm run format:check

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	Apr 4, 2026 0:30am

[rushabhcodes]

add snapshot proof

[drmabus]

Added snapshot proof.

Snapshot:

The SameNetTraceMergeSolver improves merging of close same net segments internally. The effect is more evident in test validation rather than large visual differences in this example.

Validation:

• bun test tests/examples/example29.test.ts
• bun test

Both are passing, including example29 which previously failed due to over merging.