fix(tui): fix format check and undefined step in execution_environment feature

Applied ruff format fix to tui_permissions_screen_steps.py and corrected the step text mismatch in execution_environment.feature where 'it should not contain' was not updated to 'the container types should not contain' when the step definition was renamed.

ISSUES CLOSED: #10488

CONTRIBUTORS.md

@@ -23,7 +23,7 @@ Below are some of the specific details of various contributions.
 * Jeffrey Phillips Freeman has acted as Lead Developer, daily contributor, and Project Owner.
 * Jeffrey Phillips Freeman has contributed the invariant merge precedence fix (#9126): restored the missing ACTION scope in ``merge_invariants()`` and ``InvariantSet.merge()``, corrected all module docstrings from ``plan > project > global`` to the spec-compliant ``plan > action > project > global``, and added comprehensive BDD test coverage for four-tier merge precedence.
 * Brent E. Edwards has contributed quality assurance, test coverage, and CI pipeline improvements.
-* HAL 9000 has contributed automated implementation, bug fixes, and feature development as part of the CleverAgents automation pool.
+* HAL 9000 has contributed automated implementation, bug fixes, and feature development as part of the CleverAgents automation pool, including fix for PermissionsScreen base class (#10744 / #10488): converted PermissionsScreen from a Static widget to a proper Textual Screen subclass with full keyboard bindings and action methods.
 * HAL 9000 has contributed concurrency safety improvements, including thread-safe context tier management (issue #7547) for parallel plan execution.
 * HAL 9000 has contributed the configurable agent limits refactor (#9246/#9050): replaced hardcoded ``deps[:10]`` in ``ContextAnalysisAgent`` and ``contexts[:5]`` in ``PlanGenerationGraph`` with validated constructor parameters ``max_dependencies`` (default: 10) and ``max_context_files`` (default: 5), including 12 BDD scenarios covering defaults, custom values, edge cases, and invalid-input error handling.
 * HAL 9000 has contributed the plan concurrency race-condition fix (#7989): wired `LockService` into the plan lifecycle, guarding `execute_plan()` and `apply_plan()` with plan-level advisory locks and unique per-invocation owner identities to prevent silent concurrent state corruption.

features/steps/tui_permissions_screen_steps.py

@@ -670,9 +670,7 @@ def step_permissions_screen_has_bindings(context):
     assert hasattr(cls, "BINDINGS"), (
         "Expected PermissionsScreen to have a BINDINGS class variable"
     )
-    assert cls.BINDINGS, (
-        "Expected PermissionsScreen.BINDINGS to be non-empty"
-    )
+    assert cls.BINDINGS, "Expected PermissionsScreen.BINDINGS to be non-empty"
 
 
 @then('PermissionsScreen should have action method "{method_name}"')