bd7fc8fdcd
Consolidates these related Amy fork patches: - 429830f39 feat(gateway): inject message timestamps into user messages for LLM context - 3c3d6fac0 fix: handle both ISO string and epoch float timestamps in history replay - 2874f7725 feat: human-friendly timestamp format with weekday and timezone name - 3735f4c8b fix: render gateway message timestamps once