[tmashara]

• Bump to 0.3.1 in package.json, package-lock.json, .claude-plugin/plugin.json and the README results.json sample. Ships the unreleased failed stylesheet/font reporting (c2e1bca, fe5a912).
• README hero image under the tagline: docs/img/hero.png, composed from a real run of dist/cli.js on the nav fixture at 1440px (stdout lines verbatim, origins are the fixture server's ports) next to the nav.1440.c1.png crop it wrote. Linked via raw.githubusercontent.com on main so it renders on npm too; it only resolves once this merges.
• Repo metadata (already applied, outside this diff): description, npm homepage, 15 topics from package.json keywords.

lint, format:check, typecheck and npm test (219/219) pass. Visual tests not run.

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