A conversational AI copilot that

A conversational AI copilot that takes a buyer from "I want to reserve" to contract and receipt. A LangGraph agent orchestrates 19 tools with human-in-the-loop confirmation before any payment, session memory, and RAG — over a transactional backend with hard guarantees (no double-booking, Stripe + webhook reconciliation, full audit) and a 3D/BIM viewer with a first-person walkthrough. Stack: TypeScript, LangGraph.js, Hono, PostgreSQL/Drizzle, React 19, react-three-fiber. LangSmith observability with GDPR PII redaction.