Combine the ginger, chile, onion, cumin and 1/4 teaspoon salt in a mini food processor and pulse to make a thick paste. (Or finely chop and mash with the flat side of a knife.) Mix the yogurt, lime juice, cilantro and a pinch of salt in a bowl. Cover and chill until ready to use. Heat the vegetable oil in a large skillet over medium-high heat. Add the ginger-chile paste and cook, stirring, until most of the liquid has evaporated and the mixture is slightly toasted, about 5 minutes. Stir in the chicken, carrots, 1/4 teaspoon salt and 1/2 cup water and continue to cook, stirring, until the sauce is thick and the chicken is heated through, about 2 more minutes. Season with salt. Spoon one-quarter of the chicken filling down the middle of each piece of bread. Drizzle with some of the yogurt sauce and roll up. Serve with chips.