docs: remove repository demo link

docs: link runnable Constella demo

docs: keep benchmark reporting focused on established results

docs: note full BEIR benchmark in progress

docs: explain the Constella family and recommended retrieval setup

docs: simplify and align model card

Update model card for the research preview: one FastEmbed branch for the whole family, native fp32 query vectors, canonical clean-4 results with all six beside them.

constella-zero — FastEmbed-first card, run p35w-2m-s2500

Update README.md

constella-zero — FastEmbed-first card, run p35w-2m-s2500

constella-zero — FastEmbed-first card, run p35w-2m-s2500

constella-zero — FastEmbed-first card, run p35w-2m-s2500

zero v1 — M7 lookup table, run p35w-2m-s2500

zero v1 — M7 lookup table, run p35w-2m-s2500

zero v1 — M7 lookup table, run p35w-2m-s2500

zero v1 — M7 lookup table, run p35w-2m-s2500

zero v1 — M7 lookup table, run p35w-2m-s2500

zero v1 — M7 lookup table, run p35w-2m-s2500

initial commit