okhp3-mermaid-publish

Rendering, exporting, and publishing finished Mermaid diagrams. Use after a diagram has passed okhp3-mermaid-core's three validation gates and needs to become a viewable artifact - local PNG/SVG render, embedding in a .md file, or publishing via the Mermaid Chart MCP for a shareable link. NEVER deletes rendered output; the render IS the deliverable.