fix(agent-evolution-pool-supervisor): Fix lint errors in BDD step definitions

- Remove unused imports (json, Dict, Optional)

- Fix import sorting (I001 error)

- Fix open() call to remove unnecessary mode argument

- Replace fake assert True with meaningful assertions

- Fix Behave parser type for label_name to handle "Type/Automation"

features/steps/agent_evolution_pool_supervisor_metadata_steps.py

@@ -1,9 +1,9 @@
 """Step definitions for agent evolution pool supervisor metadata assignment."""
 
-from behave import given, when, then
 from pathlib import Path
-import json
-from typing import Any, Dict, Optional
+from typing import Any
+
+from behave import given, then, when
 
 
 @given("the agent-evolution-pool-supervisor is configured")
@@ -70,7 +70,7 @@ def step_label_id_found(context: Any, label_id: int) -> None:
     )
 
 
-@then("the label name is {label_name:w}")
+@then('the label name is "{label_name}"')
 def step_label_name_is(context: Any, label_name: str) -> None:
     """Verify the label name."""
     assert context.found_label is not None, "Label should be found"
@@ -307,7 +307,7 @@ def step_agent_definition_exists(context: Any) -> None:
 @when("I read the agent definition")
 def step_read_agent_definition(context: Any) -> None:
     """Read the agent definition file."""
-    with open(context.agent_file_path, "r") as f:
+    with open(context.agent_file_path) as f:
         context.agent_definition = f.read()