layout_uv() {
    if [[ -d ".venv" ]]; then
        VIRTUAL_ENV="$(pwd)/.venv"
    fi

    if [[ -z $VIRTUAL_ENV || ! -d $VIRTUAL_ENV ]]; then
        log_status "No virtual environment exists. Executing \`uv venv\` to create one."
        if [[ -z $PYTHON_WANTED ]]; then
            # No Python version specified, just create a virtualenv
            uv venv
        else
            # Specific Python version requested, use that; will download if needed
            uv venv --python $PYTHON_WANTED
        fi
        VIRTUAL_ENV="$(pwd)/.venv"
    fi

    if [ -d ".venv/bin" ]; then
        PATH_add .venv/bin
    elif [ -d ".venv/Scripts" ]; then
        PATH_add .venv/Scripts
    fi
    export UV_ACTIVE=1  # or VENV_ACTIVE=1
    export VIRTUAL_ENV
}