Add named project snapshots

src/domain/ports/project-snapshot.store.ts

@@ -0,0 +1,26 @@
+export interface ProjectSnapshotMetadata {
+  id: string;
+  projectId: string;
+  sourceRevision: number;
+  schemaVersion: number;
+  name: string;
+  description: string | null;
+  payloadSha256: string;
+  createdAtIso: string;
+  createdByActorId: string | null;
+}
+
+export interface CreateNamedProjectSnapshotInput {
+  projectId: string;
+  expectedRevision: number;
+  name: string;
+  description?: string;
+  actorId?: string;
+}
+
+export interface ProjectSnapshotStore {
+  createNamed(
+    input: CreateNamedProjectSnapshotInput
+  ): ProjectSnapshotMetadata | null;
+  listByProject(projectId: string): ProjectSnapshotMetadata[] | null;
+}