feat: init agent&tool architecture (#311)

Author: seancoding-day

dingo/model/llm/agent/__init__.py

@@ -0,0 +1,22 @@
+"""
+Agent Framework for Dingo
+
+This package provides agent-based evaluation capabilities that extend LLMs with
+tool usage, multi-step reasoning, and adaptive context gathering.
+
+Key Components:
+- BaseAgent: Abstract base class for agent evaluators
+- Tool system: Registry and base classes for agent tools
+"""
+
+from dingo.model.llm.agent.base_agent import BaseAgent
+from dingo.model.llm.agent.tools import BaseTool, ToolConfig, ToolRegistry, get_tool, tool_register
+
+__all__ = [
+    'BaseAgent',
+    'BaseTool',
+    'ToolConfig',
+    'ToolRegistry',
+    'get_tool',
+    'tool_register',
+]