{"not_tested":"No probe attempted; no claim of reachability.","unknown":"Probe attempted but the result could not be classified.","dns_failed":"Hostname did not resolve.","tls_failed":"TCP connected but TLS handshake failed.","host_reachable_endpoint_unverified":"Host answered but the specific route was not confirmed.","http_route_reachable_no_data":"Route returned an HTTP response that is not API data (HTML splash, login page, CDN error).","auth_required":"Route returned 401 (or an auth challenge). Stopped at the barrier.","forbidden":"Route returned 403. Stopped at the barrier.","rate_limited":"Route returned 429. Stopped immediately.","retired_or_gone":"Route returned 404/410 or the host no longer serves the path.","verified_public_data":"Response is structured data (JSON/XML model) available without authorization.","verified_authorized_data":"Structured data returned using an authorized, first-party credential flow.","blocked_by_policy":"Probing refused by policy (not allowlisted, disabled, or budget exhausted)."}