By Mitch Tobin , ARIZONA DAILY STAR With pressure from the University of Arizona, the U.S. Forest Service has quietly begun pruning and cleaning the forest around the telescopes atop Mount Graham. The work, within critical habitat for an endangered squirrel, comes as UA officials worry about a catastrophic wildfire roaring through a $120 million telescope complex that environmentalists and some American Indians have fought for more than a decade. In 1996, flames from a 6,716-acre wildfire came within 200 yards of the telescopes. As the monsoon arrives, the top of the Pinaleno Mountains, 75 miles northeast of Tucson, is...