Add same-net trace axis cleanup

[dekacchi]

Summary

• add a final TraceCleanupSolver pass that aligns nearby overlapping same-net horizontal/vertical internal trace segments onto a shared axis
• preserve endpoint-only segments and reject moves that would create different-net trace, chip, or different-net label collisions
• add focused coverage for horizontal/vertical same-net alignment, different-net no-op behavior, endpoint anchoring, and update affected visual snapshots

Addresses #29 and #34.

Verification

• bun test tests/solvers/TraceCleanupSolver/alignNearbySameNetTraceSegments.test.ts tests/examples/example18.test.ts tests/examples/example19.test.ts tests/examples/example29.test.ts tests/examples/example34.test.ts
• bun test
• bunx tsc --noEmit --pretty false
• bun run format:check
• bun run build
• git diff --check

/claim #29
/claim #34

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 22, 2026 7:02pm