safeLowbit
fun safeLowbit(numLayers: Int, numHeads: Int, headDim: Int, maxSeqLen: Int): TurboQuantPreset(source)
Safe low-bit preset: Q8_0 for keys, TurboQuant-4 for values.
Keys stay at 8-bit for quality preservation; values are compressed to 4-bit TurboQuant. Good for production use where key accuracy matters more than value accuracy.