Publish modules to a registry

The CLI does not publish modules. Damat distribution is designed around Git sources and immutable tags: validate and build a module, push a tag, then let registry automation create or update the hosted package record.

damat module validate
damat module build
git tag user-v1.0.0
git push origin user-v1.0.0

The current registry index maps namespace/name@version to an immutable origin. DAMAT_REGISTRY and DAMAT_MODULE_REGISTRY accept an index URL, a registry.json path, or a directory containing that file.

{
  "modules": {
    "damatjs/user": {
      "source": "github:damatjs/user",
      "versions": {
        "1.0.0": { "source": "github:damatjs/user#user-v1.0.0" }
      },
      "owner": { "namespace": "damatjs" },
      "verification": {
        "status": "verified",
        "integrity": "sha256:..."
      }
    }
  }
}

Git tags are the stable release boundary. Branch-driven preview automation and fully automatic registry creation are later registry work. There is no npm-like damat module publish gateway flow to maintain in a module package.