Developed and integrated the Claude Vellum Theme Family as a new git submodule within the zed-industries/extensions repository, introducing both Claude Vellum Light and Claude Onyx Dark color schemes to enhance user customization. Leveraged frontend development skills and toml configuration to register the themes and ensure seamless adoption within the extension ecosystem. Applied validation gates using pnpm for sorting, testing, and building, maintaining high release standards and code quality. Collaborated with other contributors to support modular theming architecture, enabling easier future expansion and cross-team usage. The work focused on maintainability, extensibility, and providing a foundation for broader theme adoption.