1. Place chickpeas in a saucepan; add 2 quarts boiling water. Cover and let stand 1 hour; drain. Place beans in a 6-quart slow cooker.
2. Heat a large skillet over medium-high heat. Add 1 tablespoon oil to pan; swirl to coat. Add onion; sauté 4 minutes, stirring occasionally. Add garlic; sauté 1 minute, stirring constantly. Stir in tomato paste and next 5 ingredients (through turmeric); sauté 30 seconds, stirring constantly. Add onion mixture to slow cooker. Add broth and next 4 ingredients (through tomatoes) to slow cooker; cover and cook on HIGH 8 hours.
3. Heat a large skillet over medium-high heat. Add remaining 1 tablespoon oil; swirl to coat. Add squash; saute 5 minutes. Add squash to slow cooker. Cover and cook on HIGH 1 hour; stir in peas. Sprinkle with cilantro. Serve over couscous with lime wedges.