Spaghetti Squash Peanut Noodles with Chicken

Name: Spaghetti Squash Peanut Noodles with Chicken
Ingredients: 1 (3 pound) spaghetti squash, halved lengthwise and seeded; 2 tablespoons water; 1 pound boneless, skinless chicken breast, trimmed and patted dry; ½ teaspoon Chinese five-spice powder; ¼ teaspoon salt; 1 pound baby bok choy, quartered; 4 tablespoons toasted (dark) sesame oil, divided; 2 tablespoons reduced-sodium tamari; 2 tablespoons lime juice; 2 tablespoons smooth natural peanut butter; 2 teaspoons light brown sugar; 2 teaspoons grated fresh ginger; 1 large clove garlic, grated; 1 scallion, sliced