By Eric Gilmore After missing three games with an injured right knee, All-Star catcher Jason Castro returned to the lineup Friday night as the designated hitter, batting fourth against the Athletics. “It’s feeling good and hopefully it will continue to just keep improving and I’ll be back to 100 percent,” Castro said. Castro had a cyst on his right knee drained Tuesday. He tested his knee by taking batting practice and running Thursday and Friday. He said his knee felt “a lot better” Friday. “That’s why I think we decided to pull the trigger on today being the day,” Castro said. Castro said he’s not ready to resume catching and [...]