The 49ers have added another hybrid-type player to their defense, reaching agreement with Mark Washington, a former Texas State-San Marcos standout who was not selected in last week's NFL supplemental draft. Washington will sign a two-year contract for league minimum base salaries of $285,000 in 2007 and $370,000 in 2008, and the 49ers hope he can develop some of the pass-rush ability that he flashed at times during his abbreviated college career.