Generate a structured system design document from requirements and context. Use this skill whenever someone provides a system to design, describes a product or feature needing architecture, or asks for a design doc, HLD, or technical design. Also trigger when the user provides functional requirements, constraints, or scale targets and wants a structured output — even if they don't say "system design doc" explicitly. Prompts like "design a ride-sharing app", "how would you architect X", "help me think through the design for Y", or "create a design doc for Z" should all trigger this skill.
