BOSTON — The Astros’ inaugural American League season becomes a little more real Thursday, when they take on the Boston Red Sox in a 5:35 p.m. CT contest at Fenway Park. It’s only the Astros’ (7-14) second appearance at Fenway and first since 2003. The clubs play a four-game series that runs through Sunday. “This place is really special. You just walk around and you can feel and see all the history,” said Wesley Wright, who joined teammates and coaches for an afternoon tour of the park, including a trip behind the Green Monster. Astros righthander Philip Humber (0-4, 6.63 ERA) starts against Red Sox righty Clay Buchholz (4-0, 0.90). [...]