Add My AI Usage canvas extension (chronicle-stats) (#4559)

* Add My AI Usage (chronicle-stats) canvas extension

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

* Address review: a11y for charts, coaching KPIs, docs and provenance

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

---------

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

plugins/chronicle-stats/README.md

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+# My AI Usage Plugin
+
+See your local Copilot token usage by day, model, and session, and get tips to use it more efficiently.
+
+## Requirements
+
+- GitHub Copilot app with canvas support
+- Node 22.13+ (the extension uses `node:sqlite` and will not load on older Node versions)
+
+## Installation
+
+```bash
+copilot plugin install chronicle-stats@awesome-copilot
+```
+
+## Source
+
+This plugin is part of [Awesome Copilot](https://github.com/github/awesome-copilot).
+
+## License
+
+MIT

plugins/chronicle-stats/plugin.json

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+{
+  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
+  "name": "chronicle-stats",
+  "description": "See your local Copilot token usage by day, model, and session, and get tips to use it more efficiently.",
+  "version": "1.0.0",
+  "author": {
+    "name": "Julia Muiruri",
+    "url": "https://github.com/juliamuiruri4"
+  },
+  "repository": "https://github.com/github/awesome-copilot",
+  "license": "MIT",
+  "keywords": [
+    "ai-usage",
+    "canvas",
+    "chronicle",
+    "copilot-extension",
+    "cost-awareness",
+    "insights",
+    "productivity",
+    "token-usage"
+  ],
+  "extensions": {
+    "com.github.copilot": {
+      "logo": "assets/preview.png"
+    },
+    "com.github.awesome-copilot": {
+      "extensions": [
+        "./extensions/chronicle-stats"
+      ]
+    }
+  }
+}