test(config): expect dangerous command guard flag in config keys

- Add disable_dangerous_command_guard to the expected config key list so the test reflects the current configuration surface.
- Keep the key enumeration in sync with the runtime config to prevent false negatives when validating available settings.
- Preserve coverage of the config contract as new options are introduced.

Author: thomwebb

tests/test_config.py

@@ -311,6 +311,7 @@ def test_get_config_keys_with_existing_keys(
                 "compaction_threshold",
                 "default_agent",
                 "diff_context_lines",
+                "disable_dangerous_command_guard",
                 "enable_pack_agents",
                 "enable_streaming",
                 "enable_universal_constructor",
@@ -376,6 +377,7 @@ def test_get_config_keys_empty_config(
                 "compaction_threshold",
                 "default_agent",
                 "diff_context_lines",
+                "disable_dangerous_command_guard",
                 "enable_pack_agents",
                 "enable_streaming",
                 "enable_universal_constructor",