Fix recommendations from similar sites (?domain=): the domain's open problems (AI crawler refused at the edge, challenge page to crawlers, crawlers served less, AI crawler blocked in robots.txt, no llms.txt / agents.md / entity map) and, for each, the sites on the most similar stack (platform, bot protection, CDN, host) that had the same problem and fixed it - when, whether the fix still holds, and how many AI crawlers they serve now. A fix counts once two scans confirm it. Sites are not named. Signed crawlcheck-fix-recommendations.