Krikri::PipeLookupError

Raised by the pipe lookup (ExpressionEvaluator's #lookup_pipe) when the command exits non-zero - real Ansible's own failure for that shape ("The lookup plugin 'pipe' failed: lookup_plugin.pipe(<cmd>) returned <rc>.", verified live against 2.19.4), NOT the "undefined" sentinel string the code path used to return (which ajeleznov. manage-known-hosts's lookup('pipe', 'ssh-keyscan ...') then fed to the known_hosts module as a literal "undefined" key, letting the play run seven tasks past real Ansible's hard stop). Real Ansible raises regardless of how much stdout the command already produced.