Function stop_container 

async fn stop_container(
    state: &AppState,
    block_id: &str,
    before: &AgentResources,
    deadline: Instant,
) -> Option<String>

Stop a container agent’s container (spec §6.7), unless another live pane runs the same agent in it. Docker’s own SIGTERM → SIGKILL grace is bounded by what’s left of the teardown’s deadline.