Rename core -> sdk (plugin SDK, self-documenting)

services/plugin_service.py

@@ -11,9 +11,9 @@ from typing import Dict, List, Any, Optional, Callable
 from dataclasses import dataclass
 import yaml
 import traceback
-from core.plugin_command_decorator import plugin_command, command
-from core.plugin_status import PluginStatus
-from core.plugin_error import PluginConfigError, PluginLoadError
+from sdk.plugin_command_decorator import plugin_command, command
+from sdk.plugin_status import PluginStatus
+from sdk.plugin_error import PluginConfigError, PluginLoadError
 
 logger = logging.getLogger(__name__)