Remove pickle checkpoint; load only safetensors (#1)

Document the safetensors checkpoint as the canonical format; .pt kept as legacy

Add safetensors + JSON checkpoint (cua_s1.checkpoint format) so cua_s1's own loader can load it

Add safetensors + JSON checkpoint (cua_s1.checkpoint format) so cua_s1's own loader can load it

Fix stale links: project moved to github.com/trycua/cua/tree/main/libs/cua-s1

Remove stale jevform-best.pt (renamed to cua-s1-forms.pt)

Rename checkpoint to cua-s1-forms.pt to match the new libs/cua-s1 naming

Add model card

Add tinyx-128-l2-v2 checkpoint (706k params, 99.95% test top-1)

initial commit