Records the library research (JointJS core chosen), tech stack, and a
milestone checklist covering nodes, ports, edges, properties, catalogue,
mock flow and editing UX.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Set up electron-vite build (main/preload/renderer split), TypeScript
project references, Vitest config, and a secure preload bridge exposing
save/open diagram IPC.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
