Set explicit workspace tracking without following or unfollowing a brand. tracked=true uses the manual advertiser allowance. tracked=false removes explicit tracking; automatic brand coverage can remain. Read effective tracked and tracking_source in the response. Tracking is keyed by workspace and advertiser, never by brand; shared advertisers count only once, and automatic rows are exempt from the manual cap. An existing auto row retains its origin when tracked=true is repeated. Returns the full tracking row and quota; advertiser.brands lists covering followed brands.