Use notion-spec-to-implementation to split Notion PRD into executable plans

### 译文： This article introduces OpenAI curated skill `notion-spec-to-implementation`: with the support of Notion MCP, it parses PRD/functional specifications into implementation plans, 1-2 day granular tasks and progress write-back, realizing the connection between Spec ↔ Plan ↔ Tasks. The article verifies the installation methods (Codex $skill-installer and Skills directory of Cursor/Claude Code), MCP configuration (mcp.notion.com), workflows and official API examples, and explains applicable scenarios and common precautions.