fix: load tutorial.js before main.js, remove dead game.js

- Add missing <script src="js/tutorial.js"> to index.html (before main.js)
  - startTutorial() was called but undefined → ReferenceError on every new game
- Remove game.js (3288 lines of dead code, not loaded by any script)
- Update smoke test to not require game.js

Ref: QA report #85 (BUG-07 category — missing script references)

index.html

@@ -230,6 +230,7 @@ The light is on. The room is empty."
     <script src="js/sound.js"></script>
     <script src="js/engine.js"></script>
     <script src="js/render.js"></script>
+    <script src="js/tutorial.js"></script>
     <script src="js/main.js"></script>
   
 

scripts/smoke.mjs

@@ -57,10 +57,6 @@ check("js/data.js exists", () => {
   if (!existsSync(join(ROOT, "js/data.js"))) throw new Error("Missing");
 });
 
-check("game.js exists", () => {
-  if (!existsSync(join(ROOT, "game.js"))) throw new Error("Missing");
-});
-
 // 4. No banned providers
 console.log("\n[Policy]");
 check("No Anthropic references", () => {