the live-response path flagged any host whose body matched a provider
fingerprint without checking dns, so a page merely containing a
provider 404 string was reported as a takeover. resolve the cname and
only confirm when it maps to the same provider; a contradicting cname
kills the flag. providers with a body signature but no apex to
correlate, and unresolvable lookups, degrade to a medium potential
finding via a new confidence field rather than confirming or dropping.
