//! Runtime helpers that the CLI and transports share when launching ACP agents.
//!
//! This module wires together preparation (downloading binaries, building
//! command specs, tracking temporary extraction directories) with the
//! subprocess primitives and transport implementations that surface an agent's
//! stdio over different network protocols.
/// Command construction and distribution-resolution helpers.
/// Low-level child-process spawning and shutdown helpers.
/// Shared serve entrypoint and transport selection types.
/// Direct stdio execution without a network transport.
/// Concrete TCP, HTTP/2, and WebSocket transport implementations.