DSPy Pipeline Design for Code Review

Design a DSPy pipeline for your code optimization agent. Define the signature(s) (input/output schemas) for tasks like 'IdentifyIssues', 'SuggestOptimization', and 'ExplainChanges'. Outline how you'll use DSPy's modules (e.g., `ChainOfThought`, `Program` or `Retrieve`) to compose a robust workflow for analyzing code snippets and generating improvements using DeepSeek-R1. Consider how to incorporate RAG over a codebase for context.