Extend the offline CLI contract tests to the two remaining Danish
portal CLIs. Both implement the documented error contract (JSON
errors on stderr, exit 1) but had no test locking it in:
- jobindex-search: search without --query, detail without an ID,
and bunli numeric-option validation (--page not-a-number)
- jobnet-search: detail without an ID, occupations without
--search-string, suggestions without --query, and numeric-option
validation
All asserted paths exit before any network request, matching the
no-live-portal-requests CI policy. Assertions were written against
observed CLI output, not assumed shapes.
