The 4 terminal-auth-failure tests assert an unrecoverable 401 surfaces an
apperror / persisted _error turn. The settlement path first attempts the
#1401 credential self-heal, which reads ~/.hermes/auth.json. On a host with
populated credentials, self-heal can succeed and retry the mock agent,
swallowing the error the test expects -- so the result depended on host
credentials (green on CI / Windows with no creds, red on a live agent box).
Add an autouse fixture that forces _attempt_credential_self_heal to a no-op
so every host exercises the unrecoverable-failure path. The one test that
verifies a successful retry already patches the symbol in its own body, so it
is unaffected.
Co-authored-by: rodboev <rodboev@users.noreply.github.com>
