KANSAS CITY, Mo. — The Seattle Mariners have signed ace right-hander Luis Castillo to a five-year, $108 million contract extension that will keep him in Seattle through at least the 2027 season. Both the club and Castillo have options for 2028 that could push the value of the deal to $133 million, the team announced Saturday afternoon. The Mariners made a massive move at the trade deadline to acquire the 29-year-old Castillo from Cincinnati, sending four of their top prospects to the Reds. Since joining Seattle on July 28, Castillo is 3-2 with a 2.83 ERA with 13 walks and 64 strikeouts in nine…