EmDash 1.0, a stable and open-source content management system (CMS) built on Astro, has been released, offering secure sandboxed plugins, agent-friendly workflows, and a decentralized registry. This CMS allows developers to build with Astro, editors to manage content, and agents to work through APIs, CLI, or MCP servers. EmDash 1.0 includes production-tested workflows for editorial, media, localization, migration, and deployment, and features a plugin registry that enables developers to publish without handing over ownership, keeping publishers in control. Additionally, EmDash Build, an open-source AI site builder, is also available, marking a significant milestone in the EmDash ecosystem, which was first introduced in April as the "spiritual successor to WordPress".