Preserve RelayOrb card metadata per route

[khalidsaidi]

Summary

• preserve summary_large_image and twitter:image on per-route metadata overrides
• remove the unnecessary homepage metadata override so the root default stays authoritative
• strengthen the production metadata verifier to assert twitter:card and twitter:image too

Testing

• pnpm build

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep homepage OG title in sync

This expected value makes the new production verification step fail for /: the root page inherits openGraph.title and twitter.title from site/src/app/layout.tsx, and those are still RelayOrb - Tool Control Plane for AI Agents with a hyphen while the verifier asserts the em-dash title here. Because .github/workflows/deploy-site.yml now runs this script after every production deploy, site deployments will report failure even though the generated metadata matches the current layout values.

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