Teach me, in depth, how to build an AI-augmented 'digital clone' system for a small business owner or founder. Cover: (1) how to systematically extract and document tacit knowledge, decision frameworks, and tone of voice from a single operator; (2) how to structure a knowledge base that AI agents can reliably use; (3) which categories of tasks to automate first vs last, with examples; (4) tools and architectures (RAG, agents, workflow automation) with pros and cons; (5) common failure modes. End with a 90-day implementation roadmap I can start this week.