As reported yesterday, MLB, the players' union, and the umpires' union have agreed on three rule changes to be implemented immediately, all with the express purpose of—and, I believe, a very good chance of—stopping baseball games from taking so damn long. It's official now, and we have the details. "The most fundamental starting point for improving the pace of the average game involves getting into and out of breaks seamlessly," commissioner Rob Manfred said in remarks distributed by MLB this morning. An ad break in a local game is two minutes long. Going forward, there will be strict scheduling on pitchers warming up and batters getting ready to start the next half-inning, designed to put hitters in the batter's box just as the broadcast returns from c…