feat: 增强 core/agents 工具和 API

- 新增 loop.py Agent 运行循环
- 优化 memory.py 记忆模块
- 扩展 api/routes.py 接口
- 更新 tools 模块：builtin.py, manager.py, __init__.py
- 新增 .env.example 配置示例
- 更新 requirements.txt 依赖

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/agents/tools/manager.py

@@ -14,22 +14,24 @@ logger = logging.getLogger(__name__)
 class ToolManager:
     """Manages tools for the agent."""
 
-    def __init__(self, workspace: Path | None = None):
+    def __init__(self, workspace: Path | None = None, use_sandbox: bool = False):
         """Initialize tool manager.
 
         Args:
             workspace: Optional workspace path
+            use_sandbox: Whether to use sandbox for shell execution (recommended for untrusted code)
         """
         self.workspace = workspace
+        self.use_sandbox = use_sandbox
         self.registry = ToolRegistry()
         self._load_builtin_tools()
 
     def _load_builtin_tools(self) -> None:
         """Load all built-in tools."""
-        tools = get_builtin_tools(self.workspace)
+        tools = get_builtin_tools(self.workspace, use_sandbox=self.use_sandbox)
         for tool in tools:
             self.registry.register(tool)
-        logger.info(f"Loaded {len(tools)} built-in tools")
+        logger.info(f"Loaded {len(tools)} built-in tools (sandbox: {self.use_sandbox})")
 
     def register_tool(self, tool: Any) -> None:
         """Register a custom tool.