OpenAI Codex pricing change detected: floor $0 → $8/mo, model flat → hybrid

Detected automatically from the vendor pricing page. Individual plans include Free ($0/month), Go ($8/month), Plus ($20/month), and Pro (from $100/month), with a Business plan at $25/user/month when billed monthly, and an API Key option for usage-based pricing. Pending human verification (needs_review).