HLWQ rebrand: title, tags, notice, self-links

docs: add HLWQ rebrand notice (cite Han et al. PolarQuant prior art)

docs: Remove speculative BF16 standard comparison; replace unverified 'manual review 85-90%' footnote with honest gap discussion; scope 'beat BF16' claim to 9B only

Add benchmark charts to README

Add quality_vs_size.png

Add model_comparison.png

Add humaneval_thinking.png

Professional model card with benchmarks

PolarQuant v7: GPTQ INT4 gs64 + FOEM | 27B | Marlin native

initial commit