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Implements Issue #66: QJL (Quantized Johnson-Lindenstrauss) residual correction for full TurboQuant compression (PolarQuant + QJL). New files: - llama-turbo-qjl.h — QJL API with encode/decode and utility functions - llama-turbo-qjl.cpp — CPU reference implementation - ggml-metal-qjl.metal — Metal GPU kernels for encode/decode/fused dequant - tests/qjl_accuracy_test.cpp — 8 accuracy gate tests - docs/QJL_IMPLEMENTATION_PLAN.md — full implementation plan Algorithm: - Encode: PolarQuant → compute residual → JL projection → 1-bit sign quant - Decode: PolarQuant reconstruct → JL correction → add - Storage: 76 bytes/vector (vs 512 FP32 = 6.7x compression) Accuracy gates (all passing): - Cosine similarity ≥ 0.95 (direction preservation) - Max abs error ≤ 0.8, mean abs error ≤ 0.2 - Deterministic encode (reproducible) - Compression ratio > 6x vs FP32 Closes #66