Add the missing --namespace/-n option to lifecycle_list_plans() in
plan.py, mirroring the existing implementation in list_actions() in
action.py. The service layer already supported namespace filtering;
only the CLI layer was missing the option.
Changes:
- Add namespace parameter to lifecycle_list_plans() with --namespace/-n
option flags and 'Filter plans by namespace' help text
- Pass namespace through to service.list_plans(namespace=namespace, ...)
- Update TUI Filters panel to display 'Namespace: <value>' when provided
- Add usage examples to command docstring
- Add 4 Behave unit test scenarios covering --namespace/-n option
- Add 2 Robot Framework integration tests verifying namespace filtering
ISSUES CLOSED: #2165
freemo