Backplane Agent Runtime

A standalone embedded OTP execution package. Hosts own sessions, repositories, configuration, history, UI and public protocols. Optional tools and their backends start only when selected by the host. No Phoenix, database, Sigma or Backplane server application is required.

The package uses jsonschex 0.10.0 as its production JSON Schema Draft 2020-12 engine; it is intentionally not dependency-free.

Backplane.AgentRuntime.Conversation drives prompt → lazy provider stream → authorized tools → provider continuation → settlement. It is an alternative owner to the existing explicit-command ExecutionController, not another controller to run beside it. See EMBEDDING.md for contracts and an example, SCHEMAS.md for the Draft 2020-12 tool-schema boundary, and PERSISTENCE.md for host storage and recovery requirements.

examples/embedded.exs is a deterministic complete provider/tool turn. Run it from a consumer with mix run examples/embedded.exs after installing this package (or run the file from the extracted artifact). It makes no network requests.

This is not a completed Sigma migration. Collaboration spawn, delegate, send, wait, cancel and ask-user wrappers still return explicit unsupported results. Conversation interaction resolution is a local host-adapter boundary, not an implementation of those collaboration operations.