August Winningham is familiar with tear gas. While protesting racial injustice and police brutality, the Farm Spirit cook has — like countless other Portlanders — inhaled his fair share of CS gas, a “riot control agent” that severely burns the eyes and causes retching and coughing. In July, Winningham watched as Mayor Ted Wheeler, who is also the police commissioner, choked for the cameras as federal agents sprayed the crowd with tear gas, an agent Portland police had used for