There's a classic Seinfeld episode (Season 8, Ep. 22) where, after he was fired by the New York Yankees but receieved a three-month severage package, George Costanza relishes in having an entire summer off and proclaimed "The Summer of George!"     Tuesday, smack dab in the middle of July and midsummer, after Monday's MLB Home Run Derby and ahead of Tuesday's All-Star game, Happy Hour host John Gaskins declared 2025 "The Summer of Buck!"     Already one of the game's most all-around studs, already having his best pro season, Byron Buxton supplied two wow moments within three days when he hit for the cycle on Saturday — completing it with a 427-foot home run to centerfield — and by blasting 20 moon shots in the first round of Monday's derby.   Yet, many die-hard Twins fans like Monday's Happy Hour co-host Matt Zimmer still can't watch these golden moments without lamenting what could have been.   Gaskins has a message for all those who find the Summer of Buck to be bittersweet, plus a reminder of what fans can catch when they come to The Birdcage to see the Sioux Falls Canaries play on Tuesday, Wednesday, and Thursday nights this week:   The highest-scoring (by far), most home run hitting (by far), and highest-hitting team in the American Association of Professional Baseball, with six league all-stars, including two local players among the league's best five hitters. With 42 games left, the Birds are 33-25, which is excellent but good only for third place, 4.5 games back of the loaded west division's lead. But they are on pace for their third consecutive playoff berth.