Generate Excalidraw diagrams (.excalidraw JSON files) for whiteboarding, flowcharts, architecture diagrams, sequence diagrams, mind maps, wireframes, and org charts. Use when user requests diagrams, visual documentation, system architecture visualization, process flows, or any hand-drawn style diagram. Triggers on requests mentioning Excalidraw, diagram creation, flowcharts, architecture diagrams, sequence diagrams, wireframes, or visual documentation.