SAN FRANCISCO — The Giants haven’t announced the Harrison Bader move yet, but when they do, they’ll need an open 40-man spot. They made room with a minor trade on Thursday.The Giants sent right-hander Kai-Wei Teng to the Houston Astros for minor league catcher Jancel Villarroel and international slot money. The trade cuts into their pitching depth a bit, but they needed the spot for Bader, who agreed to a two-year, $20.5 million deal earlier this week. Teng, 27, made 12 appearances for the Giants the past two seasons, including seven starts last year. But the Giants added two free agents to what currently is a full rotation, and they have plenty of young depth. There are high hopes for Hayden Birdsong, who had his 2025 season go off the rails, and Teng likely would have entered camp behind Carson Whisenhunt, Blade Tidwell and Trevor McDonald, who opened eyes in two late-season appearances. Teng’s path to a roster spot would have been as a reliever, and there are reasons to think that might have been successful. While he struggled with his command as a starter and had some wild innings, he also struck out 39 batters in 29 2/3 innings.The...