Add Chakra OpenUI contract article

[tuanadr]

Summary

• adds an issue Written Content: Chakra UI + OpenUI: Building a Design-System-Aware Generative UI App #2 article on integrating Chakra UI with OpenUI through a narrow model-facing component contract
• focuses on production design-system boundaries: app-owned tokens, enum-based variants, safe action names, .ref composition, createLibrary, and rendering inside ChakraProvider
• keeps OpenUI as the structured generation layer and Chakra as the implementation layer rather than exposing raw Chakra props to the model

Validation

• git diff --check
• npx --yes markdownlint-cli "Articles/Chakra UI as the Contract for Generated Interfaces.md" --disable MD013

Disclosure

Drafting and editing were AI-assisted. I checked the article against the current OpenUI docs for defineComponent, createLibrary, .ref, componentGroups, and <Renderer />, and I am responsible for the final wording and technical accuracy.

Related: #2