It wasn’t so long ago that the name “Sears” was synonymous with American retail and with holiday shopping in particular. But times have changed, and the last Sears in Washington is closing for good this weekend. The Sears at Southcenter Mall in Tukwila opened in 1994 in what had been home, perhaps ironically, the old Frederick & Nelson space. That still-beloved local department store went through its own death throes in the middle of the George…