Add post-cleanup same-net trace combining phase

[partyplatter08-lab]

/claim #29

Summary

• Add SameNetTraceCombiningSolver as a new pipeline phase immediately after TraceCleanupSolver.
• Combine close overlapping same-net horizontal/vertical trace segments by aligning internal segments onto the stronger nearby segment while preserving trace endpoints.
• Keep different nets isolated and reject moves that would introduce stricter different-net crossings.

Tests

• npx --yes bun test tests/solvers/SameNetTraceCombiningSolver/SameNetTraceCombiningSolver.test.ts
• npx --yes bun test
• npx --yes bun run build
• npx --yes bun run format:check
• npx tsc --noEmit

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 19, 2026 7:46pm