Perf/optimize encoder#5
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- color_space: replace 6 f64 multiplies with precomputed 256-entry LUTs per channel - quantization: add inverse LUT for multiply-based quantize (avoids f64 division) - zigzag: add i16 variants zigzagEncodeI16 and runLengthEncodeI16 (avoids f64 comparisons in RLE) - bitstream: add writeBits2 fused write to reduce branch overhead - huffman: use writeBits2 for DC+AC encode (fused huffman+additional bits) - jpeg_writer: batch byte stuffing with indexOfScalar, bulk DQT table writes - encoder: wire all paths to i16 fast quantize + i16 zigzag + i16 RLE
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