feat(engine): loop idle runner with enabledLoopActionIds

src/engine/__tests__/save.test.ts

@@ -70,6 +70,15 @@ describe('createSave()', () => {
     expect(save.state.currentStoryNodeId).toBe('route_a_beat');
     expect(save.state.seenStoryNodeIds).toHaveLength(2);
   });
+
+  it('snapshots enabledLoopActionIds in the save payload and isolates from mutation', () => {
+    const state = sampleState();
+    state.enabledLoopActionIds = { rest: true };
+    const save = createSave(state, 1700);
+    expect(save.state.enabledLoopActionIds).toEqual({ rest: true });
+    state.enabledLoopActionIds.rest = false;
+    expect(save.state.enabledLoopActionIds).toEqual({ rest: true });
+  });
 });
 
 describe('serialize / deserialize round-trip', () => {
@@ -84,6 +93,27 @@ describe('serialize / deserialize round-trip', () => {
     const restored = fromExportString(toExportString(save));
     expect(restored).toEqual(save);
   });
+
+  it('preserves enabledLoopActionIds through a round-trip', () => {
+    const state = sampleState();
+    state.enabledLoopActionIds = { rest: true, patrol: false };
+    const restored = deserializeSave(serializeSave(createSave(state, 1700)));
+    expect(restored.state.enabledLoopActionIds).toEqual({ rest: true, patrol: false });
+  });
+
+  it('defaults enabledLoopActionIds to {} when absent from save JSON', () => {
+    const json = JSON.stringify({
+      version: 1,
+      savedAt: 1700,
+      state: {
+        resources: { gold: 0 },
+        activeActionId: null,
+        actionElapsedMs: 0,
+      },
+    });
+    const restored = deserializeSave(json);
+    expect(restored.state.enabledLoopActionIds).toEqual({});
+  });
 });
 
 describe('invalid / tampered saves', () => {