A second high-ranking San Jose technology official has resigned amid a city investigation into employee misconduct for favoring Cisco Systems equipment in an $8 million contract for the new downtown City Hall. Wendy Walker, the city's deputy chief information officer, resigned Wednesday. Walker's departure follows that of her boss, Wandzia Grycz, who resigned Sunday. Although Grycz was responsible for developing the contract that ultimately favored Cisco, e-mails obtained by the Mercury News show it was Walker who led most of the behind-the-scenes dialogue with Cisco -- beginning early in 2003 and extending through the selection in June of a winning...