feat: lite deep researcher implementation

src/tools/__init__.py

@@ -0,0 +1,11 @@
+from .crawl import crawl_tool
+from .python_repl import python_repl_tool
+from .search import tavily_tool
+from .bash_tool import bash_tool
+
+__all__ = [
+    "bash_tool",
+    "crawl_tool",
+    "tavily_tool",
+    "python_repl_tool",
+]