~22% less weight VRAM, lossless: base-3 packing for ternary GGUFs

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A new packing method called B3S allows ternary models (which only use -1, 0, and 1 values) to run with 22% less VRAM than standard 2-bit formats. By using base-3 logic instead of binary powers, a 9B model can shrink down to just 2GB of weights without losing any mathematical precision. This is specifically for BitNet-style models rather than general FP16 conversions.