feat: add overlap resolution phase after partition packing

[yuliuyi717-ux]

Summary

• add OverlapResolutionSolver as a final layout phase after PartitionPackingSolver
• resolve residual chip overlaps with deterministic pairwise displacement and chip-gap-aware bounds
• return overlap-resolved placement in getOutputLayout()
• include dedicated tests for solver behavior and pipeline integration

Why

Issue #12 asks for improved layout quality for the repro in #11 and suggests a new phase/technique. This adds a focused post-pack cleanup phase that removes residual overlaps without changing upstream partition logic.

TDD

• RED: added failing test file for missing solver + missing final phase
• GREEN: implemented solver + integrated phase into pipeline

Validation

bun test tests/OverlapResolutionSolver/overlap-resolution-solver.test.ts
bun test tests/LayoutPipelineSolver/LayoutPipelineSolver04.test.ts tests/PartitionPackingSolver/PartitionPackingSolver01.test.ts
bunx biome check lib/solvers/OverlapResolutionSolver/OverlapResolutionSolver.ts lib/solvers/LayoutPipelineSolver/LayoutPipelineSolver.ts tests/OverlapResolutionSolver/overlap-resolution-solver.test.ts

/claim #12

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