feat(save): persist story flags and node progress in v1

src/state/__tests__/persistence.test.ts

@@ -70,6 +70,19 @@ describe('loadGame()', () => {
     expect(result.state.actionQueue).toEqual(['b']);
   });
 
+  it('restores story fields on load', async () => {
+    const content = testContent();
+    const backend = createMemoryBackend();
+    const state = createGameState(content);
+    state.storyFlags = { route_b: true };
+    state.currentStoryNodeId = 'fork_choice';
+    state.seenStoryNodeIds = ['boot_intro'];
+    await saveGame(state, backend, 1000);
+    const loaded = await loadGame(content, backend, 1000);
+    expect(loaded.state.storyFlags.route_b).toBe(true);
+    expect(loaded.state.currentStoryNodeId).toBe('fork_choice');
+  });
+
   it('drops an active action that no longer exists in content', async () => {
     const content = testContent();
     const stale = serializeSave(