add 4B MQ4 + AWQ + GPTQ + Q8 conv1d quant (KLD 0.0662 / PPL 10.71 @ n=512 q8-KV)

Add qwen3.5-4b.mq4-lloyd (Phase B WMMA prefill research quant, PR #197)

README: add MQ4-Lloyd variant + correct repo path to -dev

Add qwen3.5-4b.mq3-lloyd (Phase A research quant)

Initial: research-gated MQ3-Lloyd disclaimer

initial commit