excalidraw-workflow

@zkzupup

Export Excalidraw diagrams to PNG and validate JSON correctness. Includes a bundled Node.js PNG export pipeline (Puppeteer + headless Chromium) and JSON correctness rules discovered from batch-exporting 378 diagrams. Use after generating an .excalidraw file to export it to PNG, or when diagrams show rendering defects (empty boxes, arrows through boxes, overlapping elements).