- Updated version to `0.9.21` in `README.md`, `package.json`, `cli-package/package.json`, and `src/utils/version.ts`.
- Updated npm version badge in `README.md` to reflect `0.9.21`.
- Synchronized `@soulcraft/brainy` dependency version to `0.9.21` in CLI package for consistency.
This release ensures accurate versioning across the project and aligns dependencies with the latest version.