Jack Siedlecki, Yale football’s boss, takes the field for his 10th season in the Elm City with two enduring legacies in tow — “The Turnaround” and “The Drought.” The upstate New York native inherited a reeling program in December 1996 and managed to transform a 1-9 wreck into an Ivy League crown two years later in 1999. But this distant memory comes as little solace to many Bulldog fans in 2006, whose last image of their beloved team was a hopelessly perplexing performance in the overtime of last year’s Game. Many have fingered Siedlecki’s controversial play-calling as a chief cause of the recent smattering of mediocre performances, and, more importantly, the five-year futility streak unmatched in the 124-year history of Harvard-Yale battles.