Use PROACTIVELY when user asks for ASCII diagrams, text diagrams, or visual representations of systems, workflows, or relationships. Triggers on "ascii diagram", "text diagram", "visualize", "show how X connects/synergizes", "diagram the flow/phases", or "illustrate relationships". Generates terminal-compatible diagrams using box-drawing characters. Supports architecture, before/after, phased migration, data flow, and relationship/synergy diagrams. Not for image generation or graphical output.