“He sounds like he’s dying.” When my wife — by no means an aficionado of diaristic indie country-rock steeped in melancholia — happened upon me listening to Friendship’s new album Caveman Wakes Up while doing yard work last weekend, her response mirrored Cher Horowitz’s disdain toward “the maudlin music of the university station” upon encountering “Fake Plastic Trees.” It’s true …