With her gap-toothed smile and intelligent yet sometimes fraught demeanor, Wendy Phillips has worked consistently for more than a decade but had not been attached to the runaway hit that should have made her a household name. She broke into TV playing the daughter of a global corporation on the short-lived CBS series "Executive Suite" (1976-77), then was the secretary to an unconventional detective on "The Eddie Capra Mysteries" (NBC, 1978-79). When she returned to series TV in 1986, it was in more high-brow material. Phillips played the eldest daughter of Richard Kiley, an ex-hippie who moved