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refactor(core): share quantization math and reuse residuals - #162
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Summary
Share quantization boundary/factor arithmetic and reuse prepared residuals in multibit encoding. Add analytical factor and underflow-sign tests; shorten search comments.
Known tradeoff: controlled checks found ~2–3% slower 128D/1-bit encoding. Tested 4-bit workloads were slightly faster; 768D/9-bit was effectively unchanged.
Testing