app+requirements: pin Gradio 5 + gradio_leaderboard, auto-refresh now works

app: fix leaderboard auto-refresh via @gr .render(key=...)

app: drive auto-refresh via gr.Timer().tick instead of every= on Dataframe

app: auto-refresh leaderboard + bootstrap logging

app: drop history-narrative prose from Submit tab

submit: drop the agree checkbox, meta.json is the only consent gate

submit: drop dead form fields, meta.json is the only source

submit: move handle_submit into its own module + add validation pipeline

refactor: split leaderboard read path into its own module

docs: rewrite Space README + About tab as declarative current state

docs: refresh stale status strings after org transfer

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