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Resolves #662. Research document covering Vitalik's Human Confirmation Firewall pattern for LLM safety. Covers: - Action risk tiers (0-4) with detection rules - Platform-specific routing (Telegram, Discord, CLI, API) - Timeout handling and cross-platform failover - Two-factor confirmation (human + LLM smart approval) - Whitelisting and confirmation fatigue prevention - Crisis-specific patterns (what never requires confirmation) - Architecture diagram - Implementation status tracker Based on Vitalik's blog post (#280), SOUL.md protocol, and current approval.py/approval_tiers.py implementations.