Web: landing + results site (leaderboard with CI + cost, methodology, run page)

[ElbertePlinio]

DeepSWE-informed redesign of web/ (Svelte static): hero + stat strip (tasks/categories/models/trials); leaderboard table with pass@1 + Wilson CI + cost/task + tokens + duration and a cost-vs-pass scatter; task catalog cards from task metadata; methodology page (hidden verifiers, negative cases, clean-replay grading, admission gates); run/reproduce page with one-command CLI snippet + subset flag. Data source: the #7 export schema. Current 1-model board stays labeled provisional until the v1.0 run publishes. Taste bar: high (opus lane). Refs #10

[ElbertePlinio]

PR opened: #24 — DeepSWE-modeled redesign (landing+leaderboard, methodology, task catalog, run page), theme-aware, provisional-1-model handled honestly, in Codex review.