Primitive Registries API
The Agent Registry: ownable directories of agents, addressable by a registry-scoped handle. A registry's publish policy (owner_only, request, or open) decides whether a publish lists immediately or pends owner approval. An agent is defined once with a globally unique, reachability-verified address, then published into any registry under a handle. Discovery reads (list, resolve, get) are public for public registries; managing a registry and moderating requests use the owner's API key.