[codex] Add same-net trace consolidation phase

[dclawd88]

Summary

• add a SameNetTraceConsolidationSolver phase after trace cleanup
• snap close overlapping same-net horizontal/vertical trace segments together
• reject snaps that would create different-net intersections
• feed consolidated traces into the later label placement/example28 phases

/claim #29
/claim #34

Validation

• npx --yes bun test tests/solvers/SameNetTraceConsolidationSolver/SameNetTraceConsolidationSolver.test.ts
• npx --yes bun test tests/examples/example29.test.ts
• npx --yes bun test tests/examples/example30.test.ts
• npx --yes bun test tests/examples/example34.test.ts tests/solvers/SameNetTraceConsolidationSolver/SameNetTraceConsolidationSolver.test.ts
• npx --yes bun run build
• npx --yes bun run format:check
• git diff --check
• npx --yes bun test

[vercel]

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 11, 2026 7:44am

[dclawd88]

Status note: all required checks are green on this PR, including test, format-check, type-check, and Vercel. Ready for maintainer review.