Unemploymentdippedslightlyto3.5percentlastmonthandemployersadded187,000jobsinthelatestgoodnewsfortheeconomy.D1.ProgressoncleaningupBoston’sthreemainriversisunevenandsomesectionsarestillreceivingfailinggrades,accordingtonewriver“reportcards.”B1.Advocatesofrentcontrolareconsideringtakingthemattertovoters,sinceMayorMichelleWu’spushhashadlittletrac-tionwithstatelawmakers.D1.TwoNavysailorswereaccusedofprovidingmilitarysecretstoChineseintelligenceofficers,accordingtoindictments.A2.Forbreakingnews,updatedstories,andmore,visitourwebsite:BostonGlobe.comVOL.304,NO.36Suggestedretailprice$3.50Saturday:Lesshumid,nice.High79-84.Low63-68.Sunday:Moreofthesame.High78-...