docs: refresh stale status strings after org transfer

docs: refresh stale science/ migration target in space README

step 6 (A2): switch space to sdk:docker, install cadgenbench from private LeForge via GH_PAT build secret

ui: render validity_rate as percentage in the leaderboard table

schema: rename model -> submission_name; seed with 3 baseline rows

step 5: leaderboard reads from submissions dataset on hub

step 3: gradio leaderboard scaffold

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