qector-testing-strategy

The QECTOR testing and validation strategy (manual 23). Covers the eight validation layers (syndrome faithfulness, property — based, exhaustive oracle, cross-decoder equivalence, DEM pipeline, LER parity, qLDPC correctness, memory behaviour, API stability, GPU kernels), the stale test-count policy, the cross-decoder equivalence tests (batch == per-shot; UF == FastUF; GPU == CPU), and the hardware-gated GPU test…