Initial commit of integrated agent system

backend/agents/agent_core.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+"""
+Compatibility layer for legacy imports.
+
+This module re-exports the newer base implementations so existing import
+paths (`from backend.agents.agent_core import EvoAgent`) continue to work while
+centralizing the actual logic in `backend.agents.base.evo_agent`.
+"""
+
+from .base.command_handler import CommandHandler
+from .base.evo_agent import EvoAgent
+from .base.tool_guard import ToolGuardMixin
+
+__all__ = [
+    "EvoAgent",
+    "ToolGuardMixin",
+    "CommandHandler",
+]