Conversational AI Agent Development

. Project Scope. This is not just a chatbot. We are building a multi-agent AI business system for MIR Fine Jewelry. The system should include a central Commander or Orchestrator Agent that coordinates specialized agents for sales and customer management, inventory and pricing, supplier management, quotes and orders, communications, invoice processing, lead prospecting, and scheduling. We want a dev experienced with Python, FastAPI, and PostgreSQL, LangGraph or Google ADK, MCP, A2A architecture, APIs, persistent memory, and multi-agent workflows. The system must use our real business data, maintain customer and supplier history, and include human approval before sensitive actions like price changes, discounts, POs, payments, or communications. Build it modular, API first, and ready to extend.