Build Python reference implementation

[joshualamerton]

Summary

IntentMesh should have a minimal Python reference implementation so the protocol is not only documentation-based.

Goal

Create a small Python-based reference implementation that demonstrates how an agent can:

• create an intent contract
• validate the contract
• pass the contract through a negotiation flow
• return a structured response

Scope

Initial implementation should include:

• intent parser
• schema validation
• basic constraint evaluation
• basic negotiation response
• simple local demo

Suggested structure

• core/intent_parser.py
• core/constraint_engine.py
• core/negotiation_engine.py
• examples/basic_demo.py

Deliverables

• minimal runnable Python prototype
• clear setup instructions
• one local example flow

Notes

This does not need to be production-ready. The goal is to make the protocol concrete and testable.