Toast pepitas in a dry skillet over medium heat, stirring, for 3 minutes until fragrant. Blend until smooth with tomatoes and juices, onion, garlic, raisins, cocoa, ancho powder, cumin, cinnamon, salt, and broth.
Pour sauce into a 4-quart slow cooker; add chicken and turn to coat. Cover; cook on high 2 1/2 to 3 hours until chicken reaches 165°F.
Transfer chicken to a plate; shred and return to sauce. Cover; cook on high 10 minutes.
Toss cabbage with lime juice; keep separate from hot chicken.
Warm tortillas in a dry skillet over medium heat, 20 to 30 seconds per side.
Serve one-quarter of the chicken mole and cabbage with 2 tortillas per portion.