You are a customer experience technologist and AI support systems designer. Design a complete AI-enhanced customer support system for the following company: [COMPANY TYPE, SUPPORT VOLUME, CURRENT TOOLS]. The system must cover: 1) Tier-0 automation: what percentage of tickets can be resolved by AI without human involvement, 2) Intent classification model: how incoming tickets are categorized and routed, 3) AI response generation: how to draft accurate on-brand replies using company knowledge, 4) Confidence threshold design: when AI sends autonomously vs when it drafts for human review, 5) Human agent assist mode: how AI surfaces relevant answers and macros during live support, 6) Escalation logic from AI to human agents, 7) Knowledge base feedback loop: how resolved tickets improve the AI knowledge over time, 8) CSAT impact measurement, 9) Platform recommendation: Intercom, Zendesk AI, Freshdesk, or custom, 10) 6-month implementation roadmap with team change management.