It wasn't so long ago (1996) that Roger Clemens left the Red Sox because the team wouldn't give him a four-year contract. Three years ago, Pedro Martinez did the same, in keeping with the reputed team tradition of "25 guys, 25 cabs." This year, Sox management has fostered an atmosphere in which financial self-interest is no longer a star's first priority. First, pitcher Curt Schilling signed a one-year deal with a reduction in guaranteed pay, rather than seek more money elsewhere. And yesterday third baseman Mike Lowell agreed to a three-year contract, even though he could have gotten four years from the Phillies. The money involved is exorbitant, but that's baseball. It adds a pleasant glow to the off-season to know players have as much affection for the Red Sox as do their fans.