{"input":[[-2,-3,-4,-1,-2,-1,-5,-3]],"expected":-1,"label":"All negative → max element is -1"}
{"input":[[-1000,1,2,3,4,5,6,7,8,-1000]],"expected":36,"label":"Positive island: 1+2+…+8=36"}
{"input":[[100,-1,100,-1,100]],"expected":298,"label":"Alternating spikes whole array: 100-1+100-1+100=298"}
