4 (6 ounce) boneless skinless chicken breast halves  | 
                                                1 tablespoon fresh lime juice  | 
                                                1 tablespoon 40% low-sodium taco seasoning (such as old el paso)  | 
                                                1/2 teaspoon sugar  | 
                                                cooking spray  | 
                                                6 (8 inch) flour tortillas  | 
                                                6 cups packaged coleslaw  | 
                                                1 (7 ounce) can green chili salsa  | 
                                                4 cups chopped tomatoes  | 
                                                1/4 cup sliced ripe olives, chopped  | 
                                                1 1/4 cups fat-free refried beans  | 
                                                1/2 cup crumbled feta cheese  | 
                                                6 tablespoons reduced-fat sour cream  | 
                                                1/4 cup fresh cilantro leaves  | 
                                                1/4 cup unsalted pumpkin seeds (optional)  |