feat(ql3): establish 3.0 incubation baseline

back/runtime/ports/taskExecutionRevisionRepository.ts

@@ -0,0 +1,13 @@
+import type { PinnedTaskExecutionRevision } from '../domain/taskExecutionRevision';
+import type { TaskExecutionRevisionSource } from './taskExecutionRevisionSource';
+
+export type InsertTaskExecutionRevisionResult = 'inserted' | 'idempotent';
+
+/** Append-only revision store. Existing identities can never be overwritten. */
+export interface TaskExecutionRevisionRepository
+  extends TaskExecutionRevisionSource {
+  insert(
+    revision: PinnedTaskExecutionRevision,
+    createdAtMs: number,
+  ): Promise<InsertTaskExecutionRevisionResult>;
+}