Add GitHub authentication support to extension

docs/vscode-extension/README.md

@@ -25,6 +25,19 @@ Search for **"AI Engineering Fluency"** in the VS Code Extensions panel, or inst
 - **Smart Estimation**: Uses character-based analysis with model-specific ratios for token estimation
 - **Intelligent Caching**: Caches processed session files to speed up subsequent updates
 - **Diagnostic Reporting**: Generate comprehensive diagnostic reports to help troubleshoot issues
+- **GitHub Authentication**: Authenticate with your GitHub account to unlock future features
+
+### GitHub Authentication (Opt-in)
+
+- **Opt-in Authentication**: Sign in with your configured GitHub account in VS Code
+- **Built-in VS Code Integration**: Uses VS Code's native authentication provider for GitHub
+- **Stored State**: Authentication state is stored in VS Code global state (no tokens stored)
+- **Future Features**: Foundation for upcoming GitHub-specific features such as:
+  - Repository-specific usage tracking
+  - Team collaboration features
+  - Advanced analytics and insights
+
+To authenticate, open the Command Palette (`Ctrl+Shift+P` / `Cmd+Shift+P`) and search for "AI Engineering Fluency: Authenticate with GitHub", or access it through the Diagnostic Report's **GitHub Auth** tab.
 
 ### Cloud Backend (Opt-in)
 

vscode-extension/CHANGELOG.md

@@ -6,6 +6,12 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 
 ## [Unreleased]
 
+### ✨ Features & Improvements
+- Added GitHub authentication support using VS Code's built-in authentication provider
+- New commands: "Authenticate with GitHub" and "Sign Out from GitHub"
+- GitHub Auth tab in Diagnostic Report panel showing authentication status
+- Foundation for future GitHub-specific features (repository tracking, team collaboration, advanced analytics)
+
 ## [0.0.27] - 2026-04-07
 
 ### ✨ Features & Improvements

vscode-extension/package.json

@@ -124,6 +124,16 @@
         "command": "copilot-token-tracker.showEnvironmental",
         "title": "Show Environmental Impact",
         "category": "AI Engineering Fluency"
+      },
+      {
+        "command": "copilot-token-tracker.authenticateGitHub",
+        "title": "Authenticate with GitHub",
+        "category": "AI Engineering Fluency"
+      },
+      {
+        "command": "copilot-token-tracker.signOutGitHub",
+        "title": "Disconnect GitHub",
+        "category": "AI Engineering Fluency"
       }
     ],
     "configuration": {