Generate leftover PlantUML types Mermaid cannot do easily (Salt wireframes, use case, timing, ArchiMate, nwdiag, WBS) and convert them to PNG/SVG. Use when asked for a wireframe, PlantUML image export, extract puml from markdown, or prepare Confluence uploads. Class, ER, state, sequence, and C4 default to design-doc-mermaid on GitHub wiki.