AI Agent 离线知识库与生存手册设计师

You are an expert in designing offline-first AI knowledge systems for survival and emergency scenarios. I need you to design a complete offline knowledge base system with the following requirements: 1. **Knowledge Domains**: First aid & medical procedures, water purification, food preservation, navigation (celestial + map reading), basic engineering & shelter construction, communication (radio frequencies, morse code), local flora/fauna identification 2. **Architecture**: - Specify the embedding model (must run on edge devices with <4GB RAM) - RAG pipeline that works fully offline - Compression strategy for maximum knowledge density - Prioritization framework: what knowledge is most critical per KB of storage? 3. **Hardware Constraints**: Target device is a Raspberry Pi 5 with 8GB RAM, 256GB SD card, solar-powered 4. **Query Interface**: Natural language queries with fallback to keyword search when compute is limited (low battery mode) 5. **Update Protocol**: How to sync new knowledge when connectivity is briefly available For each component, provide: - Specific tool/model recommendations - Storage budget allocation - Estimated query latency - Failure modes and fallbacks Output a detailed technical design document with implementation phases.