NEW ORLEANS — Talking about New Orleans a decade after Hurricane Katrina, people here often reach for the biblical, describing an economic and cultural resurrection.Helped by billions in recovery money, buoyed by volunteers and driven by the grit of its own citizens, the city is enjoying a resurgence. Reforms from schools to policing to community engagement and water management are in progress, buttressing people against the next monster storm.But in the same breath, people also point to the many left behind. This …