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What this PR does
Adds a Python-only code review agent built with LangGraph and exposed via FastAPI endpoint.
Agent flow
check_if_python → analyze_structure → check_typing → check_quality → check_security → generate_report
If non-Python code is submitted, the agent rejects it at the first node.
Endpoint
POST /review — accepts Python code, returns structured JSON:
score — 0 to 10
issues — list with type, severity, description
suggestions — concrete improvements
summary — overall assessment
Technical notes
Built with LangGraph StateGraph, state passed between nodes via ReviewState TypedDict
LLM: Gemini 1.5 Flash via langchain-google-genai
Input validated with Pydantic, max 5000 characters
Limitations & risks
5 sequential LLM calls per request — latency ~10–15s
LLM can hallucinate issues that don't exist
Depends on Gemini API availability and quota
Only supports Python code