Under the 'ask' policy a changed host key used to be a hard error. The
prompt now shows the stored and received fingerprints and offers Reject,
Accept Once (connect, keep the record) and Accept & Update (replace the
record; audited). Unknown keys gain an Accept Once option too. Strict and
accept-new still refuse changed keys without prompting. Known-host rows
written by the old app are confirmed removable by id (test).
Andy Dixon
33b17223aa