test: add deterministic overlap regression coverage for issue #12

[CuboYe]

/claim #12

Summary

Adds focused follow-up test coverage for the issue #12 lane by asserting deterministic, overlap-free pipeline output across repeated runs of the same circuit input.

What changed

• Added LayoutPipelineSolver02 deterministic overlap-free output across repeated runs test in:
  • tests/LayoutPipelineSolver/LayoutPipelineSolver02.test.ts
• New test:
  • runs LayoutPipelineSolver 3 times on the same ExampleCircuit02 input,
  • asserts zero overlaps each run,
  • asserts deterministic placement consistency for representative chip U1.

Validation

• bun test tests/LayoutPipelineSolver/LayoutPipelineSolver02.test.ts
• Result: 5 pass, 1 skip, 0 fail

Why this helps

This gives maintainers concrete regression protection for the issue #12 class (layout quality/determinism) without duplicating broader implementation already in-flight in #39.

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