Three independent test-scaffold defects blocked the unit_tests and
integration_tests gates on PR #6361's shell-safety wiring:
- features/steps/_tui_helpers.py: the mocked-shell helper patched
cleveragents.tui.input.shell_exec.run_shell_command, but modes.py
binds the symbol into its own namespace via `from ... import`. The
patch was inert, and only the CLEVERAGENTS_ALLOW_DANGEROUS_SHELL=1
gate kept the real `rm -rf /tmp` from running in the behave runner.
Patch the use site (modes.run_shell_command) instead.
- src/cleveragents/tui/widgets/prompt.py: _FallbackPromptInput (used
whenever Textual is mocked or unavailable) had no add_class /
remove_class / has_class, so the new "prompt should be marked as
dangerous" assertions raised AttributeError and the three new
scenarios errored. The production path (_TextualPromptInput) already
inherits these from textual.containers.Horizontal; the fallback now
mirrors that contract via a small self._classes set.
- robot/tui_shell_safety.robot: Catenate's space-based argument
separator collapses multi-space indentation, so the Python function
bodies (warn_callback, deny) landed at column 0 and the helper
scripts died with IndentationError before either assertion ran.
Preserve the 4-space indent with ${SPACE * 4} markers.
ISSUES CLOSED: #6361
HAL9000
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