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 when available.
+beautifulsoup4>=4.12
+seleniumbase>=4.33
+selenium>=4.20
+
+# For LLM-backed iterative planning
+deepagents>=0.5.0
+langchain>=0.3
+langchain-openai>=0.2
+langgraph>=0.6