Cook pasta in a large pot of boiling salted water, stirring occasionally, until al dente. Drain pasta, reserving 1 cup pasta cooking liquid; return pasta to pot. Toast pine nuts in a small dry skillet over medium heat, stirring occasionally, until lightly browned, 3–5 minutes. Transfer to a small bowl. Meanwhile, heat oil in a medium skillet over medium-high. Cook sausage and tomato paste, stirring, 1 minute. Stir in artichokes and sun-dried tomatoes and cook, stirring, until heated through, about 2 minutes. Remove from heat. Add sausage mixture and 3/4 cup pasta cooking liquid to pot with pasta; season with 1/4 tsp. pepper. Toss to coat and add remaining 1/4 cup pasta cooking liquid, if needed, to loosen. Divide pasta among plates. Season with pepper and top with peperoncini.