Cynthia Littleton Business EditorWGA West president David Goodman knew taking on Hollywood’s largest talent agencies would be an uphill battle from the start.But the veteran showrunner who led the guild’s campaign to reform its agency franchise rules was heartened at key junctures during the three-year fight by the strong sense of solidarity and unanimity among WGA members about the need to eliminate agency packaging fees and to clamp down on agency-affiliated production activity.On Friday, the