[1/4] chore(shared): scaffold the phaser game runtime

game/.nvmrc

@@ -0,0 +1 @@
+22

game/README.md

@@ -0,0 +1,29 @@
+# Game
+
+Use **Node 22** (`nvm use` reads `.nvmrc`). From this folder:
+
+```bash
+npm ci
+npm run dev
+npm run typecheck
+npm test
+npm run build
+npm run preview
+```
+
+Open the local URL printed by Vite. The empty 1280×720 stage starts through
+Boot → Preload → Stage, with UI running over Stage. The canvas uses whole-number
+display scaling whenever the window can hold the native view; smaller windows
+fit the entire view. Production output is `dist/`.
+
+Bootstrap scenes are in `src/core/scaffold.ts` so they do not occupy lane A's
+`src/scenes/` or `src/ui/`. Integration can replace them with the story scenes.
+Subscribe to `gameEvents` from `src/core/events.ts`; keep the returned unsubscribe
+function and call it on scene shutdown.
+
+`public/assets/placeholder/` contains plain coloured rectangles, loaded as Phaser
+JSON-hash atlases with `idle-00` frames and feet pivots `(0.5, 1)`, plus matching
+`.anims.json` files. Hero: 28×76 body in an 80 px frame; Dexter: 20 px;
+rover: 25 px; crab: 40 px; drone: 45 px; Jenny: 200×70.
+They are development stand-ins for the [production contracts](../docs/13-PRODUCTION-PIPELINE.md),
+and are never copied to `art/`. No gameplay, HUD, or collision is included yet.

game/index.html

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>DEGGSTER.EXE</title>
+  </head>
+  <body>
+    <div id="game" aria-label="DEGGSTER.EXE game"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>