QSA exact rational matched platform evidence - #81
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Begins the first fair platform-level exact-mathematics evidence lane above accepted PR80 without changing QSA semantics.
The initial carrier defines one deterministic exact-rational construction/evaluation workload in C++ using QSA
QRationaland an independently implemented matched Python control usingsympy.Rational. Both use the same(a+b)*(c-d)expression family, the same deterministic integer operands, two warmups, seven measured rounds and eight exact canonical sample outputs. The control refuses to report timing evidence unless exact sample outputs match.The only admissible performance statement from this lane is workload-specific.
sympy_over_qsa_median_time_ratio > 1may establish that QSA is faster on this exact in-process rational workload; it cannot establish general CAS superiority, NumPy/Qiskit/Aer superiority, quantum advantage or universal asymptotic advantage.This PR remains incomplete until the benchmark is executed by the existing QSA Runtime Evidence carrier with all construction/observation work charged. No throwaway workflow will be added. The result must be used to choose at most one concrete QSA arithmetic optimization rather than creating a benchmark loop.
Research-only stacked successor to accepted PR80; no merge or production promotion is authorized.