feat(save): persist action queue in v1 save payload

src/engine/save.ts

@@ -28,6 +28,7 @@ export const gameStateSchema = z.object({
   resources: z.record(z.string(), z.number()),
   activeActionId: z.string().nullable(),
   actionElapsedMs: z.number().nonnegative(),
+  actionQueue: z.array(z.string()).default([]),
 });
 
 export const saveSchema = z.object({
@@ -47,6 +48,7 @@ export function createSave(state: GameState, now: number): SaveData {
       resources: { ...state.resources },
       activeActionId: state.activeActionId,
       actionElapsedMs: state.actionElapsedMs,
+      actionQueue: [...state.actionQueue],
     },
   };
 }