- Add API_KEY config (env var) to all entry points - requireAuth helper checks Authorization: Bearer or x-api-key header - Auth applied to /v1/chat/completions, /v1/messages, /v1/models - When API_KEY is empty/unset, auth is disabled (backward compatible) - Update wrangler.toml with API_KEY variable documentation Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>