fix(resource): move inline imports to top and remove redundant import

Addresses remaining CI review feedback from HAL9001 on PR #8304:

1. Moved all cleveragents imports from inside function bodies to module-level
   in features/steps/container_clone_into_steps.py (5 functions fixed)
2. Moved BUILTIN_TYPES import from inside step_look_up_in_builtin_types()
   to module level in features/steps/devcontainer_sandbox_strategy_steps.py
3. Removed redundant inline import of EMPTY_CONTENT_HASH and BaseResourceHandler
   inside diff() method of devcontainer.py (already available at module level)
4. Fixed stale docstring referencing old 'detected' terminology in
   robot/helper_devcontainer_lifecycle.py cmd_transition_valid()

All files pass ruff format and ruff check.

features/steps/container_clone_into_steps.py

@@ -10,14 +10,27 @@ from __future__ import annotations
 from typing import Any
 from unittest.mock import MagicMock, patch
 
-from behave import given, then, when
+from behave import given, then, when  # type: ignore[import-untyped]
-from behave.runner import Context
+from behave.runner import Context  # type: ignore[import-untyped]
 
+from cleveragents.application.services._resource_registry_data import (
+    BUILTIN_TYPES,
+)
+from cleveragents.domain.models.core.container_lifecycle import (
+    ContainerLifecycleState,
+    ContainerLifecycleTracker,
+)
 from cleveragents.resource.handlers.clone_into import (
     CloneIntoError,
     clone_repo_into_container,
     validate_clone_into_url,
 )
+from cleveragents.resource.handlers.devcontainer import (
+    DevcontainerHandler,
+    clear_lifecycle_registry,
+    set_lifecycle_tracker,
+)
+from cleveragents.domain.models.core.resource import Resource
 
 # ── When steps ───────────────────────────────────────────────
 
@@ -99,8 +112,6 @@ def step_clone_into_container_at(
 @when('I look up the "{type_name}" resource type spec')
 def step_look_up_resource_type_spec(context: Context, type_name: str) -> None:
     """Look up a resource type spec from BUILTIN_TYPES."""
-    from cleveragents.application.services._resource_registry_data import BUILTIN_TYPES
-
     context.resource_type_spec = None
     for entry in BUILTIN_TYPES:
         if entry.get("name") == type_name:
@@ -290,16 +301,6 @@ def step_devcontainer_resource_with_clone_into(
     context: Context, clone_url: str, container_id: str
 ) -> None:
     """Set up a devcontainer-instance resource with clone_into property and tracker."""
-    from cleveragents.domain.models.core.container_lifecycle import (
-        ContainerLifecycleState,
-        ContainerLifecycleTracker,
-    )
-    from cleveragents.domain.models.core.resource import Resource
-    from cleveragents.resource.handlers.devcontainer import (
-        clear_lifecycle_registry,
-        set_lifecycle_tracker,
-    )
-
     # Clear any existing lifecycle state
     clear_lifecycle_registry()
 
@@ -346,8 +347,6 @@ def step_mock_clone_repo_into_container(context: Context) -> None:
 @when("DevcontainerHandler.resolve() is called for the resource")
 def step_call_devcontainer_handler_resolve(context: Context) -> None:
     """Call DevcontainerHandler.resolve() with the test resource."""
-    from cleveragents.resource.handlers.devcontainer import DevcontainerHandler
-
     handler = DevcontainerHandler()
     mock_sandbox_manager = MagicMock()
     mock_bound_resource = MagicMock()

features/steps/devcontainer_sandbox_strategy_steps.py

@@ -10,6 +10,9 @@ from __future__ import annotations
 from behave import then, when
 from behave.runner import Context
 
+from cleveragents.application.services._resource_registry_data import (
+    BUILTIN_TYPES,
+)
 from cleveragents.domain.models.core.container_lifecycle import (
     ContainerLifecycleTracker,
 )
@@ -33,8 +36,6 @@ def step_create_tracker_for_sandbox(context: Context, resource_id: str) -> None:
 @when('I look up "{type_name}" in BUILTIN_TYPES')
 def step_look_up_in_builtin_types(context: Context, type_name: str) -> None:
     """Look up a resource type entry in BUILTIN_TYPES."""
-    from cleveragents.application.services._resource_registry_data import BUILTIN_TYPES
-
     context.builtin_type_entry = None
     for entry in BUILTIN_TYPES:
         if entry.get("name") == type_name:

robot/helper_devcontainer_lifecycle.py

@@ -111,7 +111,7 @@ def cmd_enum_values() -> None:
 
 
 def cmd_transition_valid() -> None:
-    """Verify detected->building transition."""
+    """Verify discovered->building transition."""
     clear_lifecycle_registry()
     tracker = ContainerLifecycleTracker(resource_id="01ROBOTTEST0000000000001")
     tracker = transition_state(tracker, ContainerLifecycleState.BUILDING, reason="test")

src/cleveragents/resource/handlers/devcontainer.py

@@ -644,11 +644,6 @@ class DevcontainerHandler(BaseResourceHandler):
         # We construct a temporary resource pointing at other_location and
         # call the base-class content_hash directly (bypassing the
         # devcontainer override which would try to exec into the container).
-        from cleveragents.resource.handlers._base import (
-            EMPTY_CONTENT_HASH,
-            BaseResourceHandler,
-        )
-
         other_resource = resource.__class__(
             resource_id=resource.resource_id,
             name=resource.name,