Refactor VC Simplification#254
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Description
This PR refactors VC simplification passes from static to instance classes using a shared
VCSimplificationPasscontract. It also addsVCExpressionSimplificationPass<C>as an abstract base for expression simplifications, whereCis the context carried while simplifying the VC (only used in theVCArithmeticSimplificationfor now) . This removes duplicated VC chain traversal logic from folding, arithmetic, and logical simplification.VCSubstitutionimplements the pass interface directly because it rewrites the whole VC chain rather than simplifying a refinement expression.Type of change
Checklist
mvn testpasses locally