fix(cli): log suppressed facade dispatch exceptions in session create

Replace __import__("datetime") with proper top-level import
per project Python import rules. This resolves the CI lint failure
blocking PR #10898.

Closes #10433

Refs: #10414 #10898

features/steps/tdd_session_create_suppress_exception_steps.py

@@ -14,6 +14,7 @@ recorded but the session creation remains non-fatal.
 
 from __future__ import annotations
 
+from datetime import datetime
 import logging
 from unittest.mock import MagicMock, patch
 
@@ -36,8 +37,8 @@ def _make_mock_session() -> MagicMock:
     mock_session.actor_name = None
     mock_session.namespace = "default"
     mock_session.message_count = 0
-    mock_session.created_at = __import__("datetime").datetime(2026, 1, 1, 0, 0, 0)
-    mock_session.updated_at = __import__("datetime").datetime(2026, 1, 1, 0, 0, 0)
+    mock_session.created_at = datetime(2026, 1, 1, 0, 0, 0)
+    mock_session.updated_at = datetime(2026, 1, 1, 0, 0, 0)
     return mock_session