feat(ql3): establish 3.0 incubation baseline

back/runtime/ports/taskExecutionRevisionSource.ts

@@ -0,0 +1,14 @@
+import type { PinnedTaskExecutionRevision } from '../domain/taskExecutionRevision';
+
+export interface TaskExecutionRevisionRequest {
+  projectId: string;
+  taskId: string;
+  taskRevision: string;
+}
+
+/** Reads an immutable revision; implementations must not fall back to latest. */
+export interface TaskExecutionRevisionSource {
+  resolve(
+    request: Readonly<TaskExecutionRevisionRequest>,
+  ): Promise<PinnedTaskExecutionRevision | null>;
+}