docs: add DFlash/DSpark speculative decoding research + quantization-by-hardware guide
- DFlash DSpark Speculative Decoding.md: verified method details (DFlash
block diffusion from Z Lab arXiv:2602.06036; DSpark semi-autoregressive from
DeepSeek arXiv:2607.05147), runtime support matrix (vLLM/llama.cpp/SGLang),
exact vLLM --speculative-config recipes (incl. dflash/dspark), llama.cpp
--spec-type recipes with sidecar auto-discovery, draft model table
(z-lab Qwen3.6-27B-DFlash 2B, Qwen3.6-35B-A3B-DFlash 0.4B), deployment
guidance for RTX 3090 (AWQ+Dflash) and Strix Halo (ROCmFPX MTP), measured
45-50 t/s MTP decode on Strix Halo
- Quantization by Hardware Architecture.md: FP8/INT8/INT4/GPTQ/AWQ/GGUF/FP4/
ROCmFP4 support per NVIDIA (Turing/Ampere/Ada/Hopper/Blackwell), AMD
(CDNA MI250/MI300/MI350, RDNA 3/3.5/4), and CPU; recommended picks per
Dankserver (AWQ/GPTQ 4-bit) and Dankclaw (ROCmFP4/Q4_K_M)
- index.md: link both new pages under Speculative Decoding & Quantization