UI Runtime Docs

This file is the technical index for RealmUI.

• Overview: docs/ui/README.md
• Runtime architecture (render/input/output): docs/ui/RUNTIME.md
• Supported widgets and nodes: docs/ui/WIDGETS.md
• UI events and flow: docs/ui/EVENTS.md
• Painter/paths/clipping: docs/ui/PAINTER.md
• Limitations and fallbacks: docs/ui/LIMITATIONS.md

Command reference remains in docs/cmds/*.