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langchain-langgraph-human-in-loop

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# LangChain LangGraph Human-in-the-Loop (Python)

## Overview

A team adds `interrupt_before=["send_email"]` to require a human approval
before the email goes out. First integration test crashes at the interrupt
boundary with:

```
TypeError: Object of type datetime is not JSON serializable
```

The culprit is two nodes upstream: a `classify` node stashed
`"received_at": datetime.utcnow()` into state. Every node-level unit test
passed because node completion does not serialize state — only the
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