Reorder FWHT output by sequency to group similar-frequency components
Within error bars (±0.164). Random sign arrays in PolarQuant already decorrelate all FWHT output elements, making them identically distributed. Sequency reordering cannot improve intra-block variance when frequency structure is destroyed by random signs. GSR paper's gains (PPL 20.29→11.59) were with non-randomized Hadamard only. IMPLICATION: any technique that relies on frequency-domain structure of Hadamard output (Walsh ordering, spectral grouping, frequency-aware quantization) is incompatible with random-sign PolarQuant rotation.