feat(primo): add task context tooltips on current dev

feat(primo): add task tooltips and custom social preview

Report raw perturbation Spearman

Anchor the Elo on the HVG-1200-genes baseline

Center cross-species perturbation scores on human cohort

Add residual Spearman perturbation scoring

Add task-by-repeat Elo leaderboard

Use repeated subject-grouped CV scoring

Rewrite the Space copy: remove em-dashes, soften phrasing

Rank all-NaN entries last; tidy truncated blurbs

Cohort-aware counts, name ownership, single-fetch render, honest Mean labelling

Per-category leaderboard (drop skill)

Rename Lodestar -> PRIMO

Task-based evaluator

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