📄️ 5.1 Why Single-Prompt Fails
Context overload, instruction drift, and quality degradation in single-prompt designs.
📄️ 5.2 LangChain Basics
Chains, prompts, output parsers, and LCEL (LangChain Expression Language).
📄️ 5.3 Sequential Chains
Stage 1 output → Stage 2 input, and data transformation between pipeline stages.
📄️ 5.4 Parallel & Branching
Fan-out/fan-in patterns, conditional routing, and aspect-based decomposition.
📄️ 5.5 Multi-Stage Generation
Extract → Transform → Generate → Validate pipeline design for reliable LLM output.