Give product pages a hero, and keep the owl the same at every size.

[suthat]

Summary

• Product pages now share one hero (kicker, summary, actions, visual) from scripts/site/marketing.mjs, so a positioning change is one edit instead of two hundred HTML files.
• check-site.mjs treats that visual as a contract: a product page without a hero, a nav that drifted, banned marketing copy, or a stylesheet without a content hash fails the build.
• Every tab, install, and social size is rasterised from the same guardian owl mark (pnpm brand:build), plus a web manifest. The site/ HTML is the regenerated output — pnpm site:check fails if it is not rebuilt.

Test plan

• pnpm site:check passes (generator current, and the committed site satisfies the new checks)
• Home, vet, agent-config, MCP, offline, coverage, and the four compare pages each show a product visual above the long-form copy
• Primary nav is the same order on every page; 404 is noindex,follow
• Favicon, Apple touch icon, 512 icon, and og.png all use the same owl geometry
• No JS, font CDN, or host outside the allowlist shipped

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