OpenPencil programmable editor, scene graph, Figma codec and DOM/CSS conversion

Document status: reviewed. Canonical source.

Summary

OpenPencil exposes its editor engine, scene graph, .fig/Kiwi codec, DOM/CSS conversion, CLI, RPC and MCP surfaces. It proves a modern design editor can treat programmatic control as a first-class surface.

NUIF relevance

Borrow the operational lesson: editor actions, document querying, linting and export must be available headlessly. NUIF differs by making a neutral authored model canonical instead of centering compatibility with an existing vendor model.