Tweak getOngoingEngagementIds to return a readonly array

Author: CarsonF

src/components/engagement/engagement.repository.ts

@@ -502,7 +502,7 @@ export class EngagementRepository extends CommonRepository {
   async getOngoingEngagementIds(
     projectId: ID,
     excludes: EngagementStatus[] = [],
-  ) {
+  ): Promise<readonly ID[]> {
     const rows = await this.db
       .query()
       .match([

src/components/engagement/handlers/update-engagement-status.handler.ts

@@ -130,7 +130,7 @@ export class UpdateEngagementStatusHandler
 
   private async updateEngagements(
     status: EngagementStatus,
-    engagementIds: ID[],
+    engagementIds: readonly ID[],
     type: ProjectType,
     session: Session,
   ) {