Adds an optional synthetic edge-response comparison for OAI-SearchBot, Claude-SearchBot, and PerplexityBot. The CLI --edge mode and GitHub Action check-edge-responses input report observed HTTP status, bounded reachability classification, and Cloudflare response-header presence. Existing robots.txt behavior remains the default. Synthetic requests are explicitly documented as unauthenticated and not proof of provider crawling, indexing, citation, ranking, traffic, or revenue.