feat(ql3): establish 3.0 incubation baseline

back/runtime/ports/workerExecutionOfferJournalOwnership.ts

@@ -0,0 +1,11 @@
+export type WorkerExecutionOfferJournalOwnershipState =
+  | 'unowned'
+  | 'owned'
+  | 'releasing'
+  | 'compromised';
+
+export interface WorkerExecutionOfferJournalOwnership {
+  ownershipState(): WorkerExecutionOfferJournalOwnershipState;
+  acquireOwnership(): Promise<'acquired' | 'already_owned'>;
+  releaseOwnership(): Promise<'released' | 'not_owned' | 'compromised'>;
+}