Rename checkpoint folders by benchmark suite

Defer training-code release: remove training commands from cards

Sync model cards with GitHub release: paper-format results tables, spider plots, corrected citation

Link to companion GitHub repo + add HF→code quickstart

Update root README: swap Goal to v7+KL=0.1 @ 25k (97.8% STD), add Std column

Update root README with all 4 ckpts

Add repo-root README listing Spatial v7+KL0.1 ckpt

initial commit