The CEO of a Redwood City software startup is the latest person entangled in this year's string of Silicon Valley sexual harassment scandals. A former employee of BetterWorks Systems Inc. filed a lawsuit this week against CEO Kris Duggan and two other executives of the performance management software startup. It makes claims of sexual harassment, physical assault and a work environment that’s hostile to women. Keep track of Silicon Valley's founders and funders with our free TechFlash newsletter Beatrice…