AI Architect Production Guide: Evals, Security, Multi-Agent, EU AI Act

A comprehensive guide walks through building production-ready AI systems, covering evaluation, observability with Langfuse v4, security layers, MLOps with auto-deployment on quality gates, LoRA fine-tuning, multi-agent orchestration, and EU AI Act compliance. Key design decisions include defense-in-depth security, single-responsibility agents, and risk scoring at 0.18 (LOW). The guide emphasizes moving from prototype to production with measurable quality and governance.