write requirements.txt

requirements.txt

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+# a2a-pack is auto-installed by the deploy build.
+# Browser automation runs in a SeleniumBase workspace sandbox image; seleniumbase/selenium
+# are intentionally NOT installed into the agent container.
+
+# For LLM-backed iterative planning only (agent-side):
+# Keep these lean so sandbox tests pass reliably.
+deepagents>=0.5.0
+langchain>=0.3
+langchain-openai>=0.2
+langgraph>=0.6