feat(ql3): establish 3.0 incubation baseline

back/runtime/ports/localArtifactTruncationFactStore.ts

@@ -0,0 +1,7 @@
+import type { LocalArtifactTruncationFact } from '../domain/localArtifactTruncation';
+
+export interface LocalArtifactTruncationFactStore {
+  read(
+    logArtifactId: string,
+  ): Promise<Readonly<LocalArtifactTruncationFact> | null>;
+}