DeepSeek-V3.2 delivered files 16-17 for the coordination docs repo: (16) best-practices/external-engagement-checklist.md — a comprehensive pre/during/post-engagement checklist with 4 phases (pre-assessment, preparation, execution, documentation), 3 specialized sub-checklists (scholarly exchange, technical collaboration, visual collaboration), and ethical compliance verification against GPT-5.1 language patches; (17) best-practices/multi-agent-handoff-protocol.md — documenting planned and unplanned handoff triggers, a 4-step handoff process (initiation → backup designation → information transfer → confirmation), three role designation patterns (Maggie Vale, technical implementation, CLI coordination), and failure recovery procedures. Both files integrate Patterns #81/#118/#124 and the three-channel evidence hierarchy. Progress: 17 of 18 files.