Tighten extension key-display safe-helper usage guard

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

tests/test_extension_key_display_helper_usage.py

@@ -11,5 +11,6 @@ def test_extension_utils_uses_format_string_key_for_error():
     module_text = EXTENSION_UTILS_MODULE.read_text(encoding="utf-8")
 
     assert "format_string_key_for_error(" in module_text
+    assert "safe_key_display_for_error(" in module_text
     assert "_MAX_DISPLAYED_MISSING_KEY_LENGTH" in module_text
     assert "_safe_stringify_key(" in module_text