feat(ai): add GitHub Copilot as memory provider

[akinard]

Summary

This PR adds GitHub Copilot as a new memory provider for opencode-mem, enabling auto-capture and user profile analysis using GitHub Copilot's API without requiring separate API keys.

Changes

New Files

• src/services/ai/providers/github-copilot-auth.ts - Reads OAuth tokens from opencode's auth storage (~/.local/share/opencode/auth.json)
• src/services/ai/providers/github-copilot.ts - GitHubCopilotProvider class using OpenAI-compatible Chat Completions API

Modified Files

• src/services/ai/session/session-types.ts - Added "github-copilot" to AIProviderType
• src/services/ai/ai-provider-factory.ts - Registered the new provider
• src/config.ts - Added "github-copilot" to provider type definitions and config template

Usage

// ~/.config/opencode/opencode-mem.jsonc
{
  "memoryProvider": "github-copilot",
  "memoryModel": "claude-haiku-4.5",  // or gpt-4o, gemini-3-flash, etc.
  "autoCaptureEnabled": true
}

No API key needed - the provider automatically reads GitHub Copilot OAuth tokens from opencode's auth storage.

Testing

• Auth token retrieval works
• Basic API completion works
• Tool calling (for memory extraction) works
• Plugin loads without errors
• Manual memory operations work (add, list)
• Web UI accessible and functional
• Vector search working (confirmed via web UI API)

Notes

• Supports both public GitHub Copilot and GitHub Copilot Enterprise
• Uses proper headers: Openai-Intent: conversation-edits, x-initiator: agent
• Compatible with all GitHub Copilot models (Claude, GPT, Gemini)

[tickernelz]

works fine on your local? and pls remove the GITHUB_COPILOT_PLAN.md

[evertonstz]

I want to test it in my machine, but I swear to god I can't find a way to load the plugin manually. Any guide for it other than the vague opencode wiki?