Experimental, transport-neutral lifecycle contracts for DeepCode runtimes and clients.

The package deliberately has no Node.js, Tauri, React, or model-provider dependency. Durable events describe thread, turn, and completed-item state. Streaming text, structured tool/usage activity, and interactive approval/user-input requests are transient and excluded from record/replay snapshots; their final outcomes are persisted as completed items.

This is an internal experimental boundary. Consumers must negotiate protocolVersion through initialize instead of assuming backwards compatibility.