Add same-net trace combining phase

[WhiteEagle-12]

Summary

Adds a focused post-cleanup SameNetTraceCombiningSolver phase for #29. The new phase:

• groups routed traces by globalConnNetId
• detects close overlapping internal horizontal/vertical segments on the same net
• aligns the movable segment onto the longer segment's axis
• preserves endpoint/pin segments
• avoids changes that increase strict crossings with different-net traces

The phase is wired after TraceCleanupSolver, before the second net-label placement pass and Example28Solver, so downstream placement uses the combined trace geometry.

Verification

• npx --yes bun test tests/solvers/SameNetTraceCombiningSolver/SameNetTraceCombiningSolver.test.ts
• npx --yes bun test tests/examples/example29.test.ts tests/examples/example30.test.ts tests/examples/example34.test.ts
• npx --yes -p typescript@5.9.3 tsc --noEmit
• npm run build

/claim #29

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 17, 2026 7:30pm