page-constructor

Use this skill when the user asks to create a new block, sub-block, or component in the @gravity-ui/page-constructor project (or any repo whose layout matches `src/blocks/*`, `src/sub-blocks/*`, `src/components/*` with `__stories__` folders). Trigger on phrases like "create a new block", "add a component", "scaffold a sub-block", "I need a new hero variant", "add a card to the layout", or whenever the user wants to scaffold a page-constructor entity end-to-end. Generates the implementation files (`*.tsx`, `*.scss`, `schema.ts`, etc.) AND the `__stories__/` content (`*.stories.tsx`, `data.json`, `*.mdx`) with correct Storybook routing and mock data, plus full wiring (blockMap, BlockType/SubBlockType enum, exports, schema registration). Skip for purely non-scaffolding asks ("explain how Banner works", "fix a bug in BasicCard").