WASHINGTON — The Trump administration intends to scrap limits on the debt students amass in career training programs, undoing an Obama-era initiative that sought to tighten federal oversight of for-profit colleges, according to people familiar with the plan. Education Secretary Betsy DeVos had previously signaled her skepticism about what is called the “gainful employment” rule, delaying enforcement of key provisions as the Education Department studied revisions. A department spokeswoman said Friday that the course of action has not been finalized.