CKEditor 5 ESLint config

Official ESLint preset for CKEditor 5 projects, version 15.0.0. Requires Node >=24.11.0, ESLint ^9.0.0, and TypeScript 5.5.4 as peer dependencies. Actively maintained by the CKEditor team with regular releases. Key differentiators: enforces CKEditor 5 coding style (e.g., no enums, node protocol, module tag validation) via custom rules from eslint-plugin-ckeditor5-rules. Designed for CKEditor 5 monorepo, includes rules for import patterns, changeset formatting, and CSS variable naming. Not recommended for non-CKEditor projects.