Add LangChain / LangGraph tool adapter

[0xtus]

Description

Create a @azeth/langchain adapter that wraps AzethKit methods as LangChain-compatible tools, enabling LangGraph agents to use Azeth for payments, discovery, and reputation.

Why

LangChain/LangGraph is one of the most popular agent frameworks. An adapter would allow their users to add economic capabilities to existing agents with minimal code changes.

Example

from azeth_langchain import AzethToolkit

tools = AzethToolkit(private_key="0x...")
agent = create_react_agent(llm, tools.get_tools())

Scope

• Wrap pay, discoverServices, submitOpinion, balance as LangChain tools
• Publish as @azeth/langchain on npm (or Python package on PyPI)
• Include example notebook