Function execute_request_with_cancel 

pub fn execute_request_with_cancel(
    request: &ToolUseRequest,
    root: &Path,
    cancel: &CancelToken,
) -> ToolExecution

Execute a run_shell request with the cancellation token for its enclosing agent run.

The registry entry uses execute_request to preserve its stable generic executor signature. The live agent dispatcher calls this variant so stopping an agent also terminates its active shell child.