v0.2.0 - LangGraph & LangChain Support

🚀 What's New

This release transforms MemState from a standalone engine into a fully integrated part of the AI ecosystem.

🦜 Native LangGraph Support

You can now use MemState as a persistence layer for LangGraph agents.

• New MemStateCheckpointer: Replaces the default SqliteSaver.
• Full State History: Persists not just chat messages, but the entire graph state (variables, tool outputs).
• Human-in-the-loop ready: Supports put_writes and interrupt_before.
• Thread Management: Easily clear conversation history with delete_thread.

📂 New Examples

We added production-ready demos to the examples/ folder:

1. LangGraph Persistence: Zero-config demo showing state recovery after a process restart.
2. Pizza Agent: An advanced stateful agent that separates conversational context from business data (orders).

📦 Installation

New optional dependencies group added:

pip install memstate[langgraph]

🛠 Fixes & Improvements

• Added put_writes and delete_thread methods to checkpointer.
• Updated README with architecture diagrams and LangGraph snippets.

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Full Changelog: 0.1.0...0.2.0