修改了nanobot，往Hermes agent的风格走，进度1/3

app-instance/backend/beaver/tools/builtins/__init__.py

@@ -0,0 +1,17 @@
+"""Built-in Beaver tools."""
+
+from .echo import EchoTool, echo_tool
+from .memory import MemoryTool, memory_tool
+from .skill_view import SkillViewTool, skill_view
+from .session_search import SessionSearchTool, session_search
+
+__all__ = [
+    "EchoTool",
+    "MemoryTool",
+    "SkillViewTool",
+    "SessionSearchTool",
+    "echo_tool",
+    "memory_tool",
+    "skill_view",
+    "session_search",
+]