add requirements.txt

requirements.txt

@@ -1,6 +1,3 @@
-deepagents>=0.6.3
-langchain>=1.3.0
+deepagents
 langchain-openai>=0.3.0
-langchain-core>=0.3.0
-duckduckgo-search>=3.0.0
-python-dotenv>=1.0.0
+duckduckgo-search