Don’t tell Bo Porter the Astros aren’t any good. Don’t tell a first-year manager he can’t change a young, rebuilding club’s culture before a single regular-season game is played. Don’t mention the unavoidable potential for three consecutive 100-loss seasons. Don’t reference key minor league prospects at least two years away from the big leagues; an opening-day payroll that’s by far the lowest in baseball; a mix-and-match roster of low-level castoffs and late-career veterans many believe will produce the worst team in the sport for three years running. And don’t, under any circumstances, ever even consider mentioning the “R” word: rebuilding. “I didn’t even know that word was in the dictionary,” Porter said. “I haven’t used that word, not one time, since Sept. 27 last year. And I’m not planning on using it.”