docs: point the code link at AlignmentResearch/fibs-probes (paper renamed to Telling FIBS)

Update README.md

Camera-ready probes: 9 models x {linear, mlp, efc, axial} trained on FIBSv1 @ 65dccf12

Convert probe_metadata.json to schema 1 (input_window, readout)

MIT licence for our contribution; card wording

Card: describe each directory as a trained probe

Add probe weights: 7 models x {linear, mlp, efc, axial}

initial commit