Bring water to a boil in a medium saucepan; gradually stir in cous couse. Remove from heat; cover and let stand 5 minutes. Fluff with a fork; cool.
Combine lime juice and next 5 ingredients (juice through coriander) in a large bowl, stir well with a whisk. Add cous cous, chopped nectarines, spinach, onions, and chickpeas; toss well. Garnish with nectarine slices, if desired.
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