Domain -> security letter grade (0-100, A-F) from HTTPS reachability, security headers (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy), and CAA records. Reports HTTPS connect success/failure, not raw cert expiry -- Workers can't read a remote server's cert metadata directly. For registration facts use /domain-intel; for URL reputation use /linkcheck.

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