Add Token Pac-Man canvas extension (#2175)

* Add Token Pac-Man canvas extension

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Address Token Pac-Man review feedback

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

extensions/token-pacman/canvas.json

@@ -0,0 +1,28 @@
+{
+  "id": "token-pacman",
+  "name": "Token Pac-Man",
+  "description": "Visualizes live session AI-credit usage as a Pac-Man board with pellets, ghosts, fruit milestones, and game-over limits.",
+  "version": "1.0.0",
+  "author": {
+    "name": "James Montemagno",
+    "url": "https://github.com/jamesmontemagno"
+  },
+  "keywords": [
+    "ai-credits",
+    "copilot-canvas",
+    "interactive-canvas",
+    "pac-man",
+    "quota-tracking",
+    "session-usage"
+  ],
+  "screenshots": {
+    "icon": {
+      "path": "assets/preview.png",
+      "type": "image/png"
+    },
+    "gallery": {
+      "path": "assets/preview.png",
+      "type": "image/png"
+    }
+  }
+}