Provide requirements for dyslexia screening and limit advancement to grade four under the Nebraska Reading Improvement Act

LB 1050 amends Nebraska's Reading Improvement Act to require students in kindergarten through third grade to meet a reading proficiency threshold before advancing to fourth grade. School districts must administer approved reading assessments three times annually, identifying students scoring below the threshold as having a "reading deficiency" that prevents grade advancement until proficiency is achieved. The bill establishes specific performance thresholds for assessments and creates a test-based portfolio option by January 2027 to demonstrate grade-level reading mastery. This directly affects K-3 students in Nebraska public schools, requiring them to demonstrate grade-level reading skills before moving to fourth grade.