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>

Author: jamesmontemagno

extensions/token-pacman/README.md

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+# Token Pac-Man
+
+A GitHub Copilot canvas that visualizes live session AI-credit usage as a Pac-Man board. Pac-Man eats pellets as credits are consumed, ghosts chase him, fruit milestones appear, and the game ends when the configured session credit limit is exceeded.
+
+## Files
+
+- `extension.mjs` - canvas declaration, loopback server, live usage/quota syncing, and agent actions.
+- `assets/preview.png` - gallery preview image required by the Awesome Copilot canvas catalog.
+- `assets/token-pacman.jpg` - source screenshot included for the gallery.
+- `copilot-extension.json` - Copilot extension name/version metadata for gist installs.
+- `canvas.json` - Awesome Copilot gallery metadata.
+- `package.json` - extension metadata used by the generated website catalog.
+
+## Install
+
+Ask Copilot to install the committed extension URL:
+
+```text
+Install this extension: https://github.com/github/awesome-copilot/tree/main/extensions/token-pacman
+```
+
+The shared gist version is also available at:
+
+```text
+https://gist.github.com/jamesmontemagno/75d701d25f49c94ba332529fb8ec1346
+```
+
+## Agent actions
+
+- `sync_usage` - refresh the canvas from the active session's accumulated AI-credit usage and plan entitlement.
+- `set_limit { limit }` - set the AI-credit limit that triggers game over and resync the pellet board.
+- `reset_run` - clear the visible fruit streak and start a fresh chase without changing the live session credit total.

extensions/token-pacman/assets/preview.png

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+{
+  "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"
+    }
+  }
+}

extensions/token-pacman/assets/token-pacman.jpg

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+{
+  "name": "token-pacman",
+  "version": 1
+}

extensions/token-pacman/canvas.json

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+{
+  "name": "token-pacman",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "extension.mjs",
+  "dependencies": {
+    "@github/copilot-sdk": "latest"
+  },
+  "description": "Visualizes live session AI-credit usage as a Pac-Man board with pellets, ghosts, fruit milestones, and game-over limits.",
+  "keywords": [
+    "ai-credits",
+    "copilot-canvas",
+    "interactive-canvas",
+    "pac-man",
+    "quota-tracking",
+    "session-usage"
+  ]
+}