// In close_farm function - contract owner can close farms
ensure!(
    farm.owner == info.sender || cw_ownable::is_owner(deps.storage, &info.sender)?,
    ContractError::Unauthorized
);

// In expand_farm function - only farm owner can expand
ensure!(farm.owner == info.sender, ContractError::Unauthorized);
// Add contract owner check to expand_farm
ensure!(
    farm.owner == info.sender || cw_ownable::is_owner(deps.storage, &info.sender)?,
    ContractError::Unauthorized
);
