feat: solution for 'Экзамен: Самокорректирующийся агент'

SOLUTION.md

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+**What was implemented**  
+I added the missing dependencies to `requirements.txt` so the project can import the required modules.
+
+**Why it satisfies the requirement**  
+The assignment explicitly asks for the packages `langgraph` and `langchain-openai` to be listed in `requirements.txt`. By including them, the environment will install these libraries and the code that imports them will run without `ModuleNotFoundError`.
+
+**Key code excerpts**
+
+```txt
+# requirements.txt
+langgraph
+langchain-openai
+```
+
+This file now contains the two packages, matching the reviewer’s feedback.
+
+**Limitations**  
+None – the change is straightforward and fully addresses the requested update.