LangGraph Streaming Modes and Custom Data - Part 2/21

Description:
Learn how LangGraph implements stateful workflows using directed graphs and typed state machines. This tutorial covers graph construction, node registration, and linear execution paths without streaming.

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Zen Koan Explanation:
The code defines a sequential workflow where `refine_topic` first modifies the state by appending " and cats" to the `topic` field, while `generate_joke` remains inactive until its turn. This mirrors the koan's imagery of `refine_topic` actively shaping the topic (like grafting onto a spine) while `generate_joke` waits passively (napping in the void) until the refined topic is passed to it.

Source: https://docs.langchain.com/oss/python/langgraph/streaming