docs: eval/scoring.md and docs/scoring.md are duplicate copies that have started to drift (one points at the deprecated leaderboard)

[reacher-z]

eval/scoring.md and docs/scoring.md are both 190 lines and ~identical — but they have already started to drift, and the drift is in the links that matter:

	eval/scoring.md	docs/scoring.md
Live leaderboard	huggingface.co/spaces/NAIL-Group/clawbench-leaderboard (superseded — kept only as a historical mirror per the 2026.05.12 news entry)	huggingface.co/spaces/TIGER-Lab/ClawBench (canonical)
HF data card	datasets/NAIL-Group/ClawBench	spaces/TIGER-Lab/ClawBench (points at a Space, not a dataset)

README links both: line 190 sends readers to docs/scoring.md, line 268 sends them to eval/scoring.md. zh-CN links eval/scoring.md twice. So a reader following "the scoring formula" gets one of two documents depending on which link they clicked, and one of them steers them to a deprecated leaderboard.

Fix: pick one canonical location (docs/scoring.md matches where the rest of the prose docs now live after #283), make the other a one-line stub pointing at it, and update the four inbound links. Also fix the spaces/ vs datasets/ mixup on the data-card row while touching it.

Related: this class of bug is what #291's markdown link checker guards against structurally, but it can't catch two files that both exist and disagree.

[reacher-z]

@Perry2004 — filed from a read-only audit of main; every claim is cited to file:line and was re-verified by hand before filing. Flagging for your triage: happy to send a PR for any of these you want picked up, or to close it if you judge the behaviour intentional.