## Your Task

1. Read the full app PRD at `prd-main.md` (in the same directory as this file)
2. Read the PRD at `prd.json` (in the same directory as this file)
3. Read the progress log at `progress.txt` (check Codebase Patterns section first)
4. **DO YOUR JOB**
5. Update the PRD to set `passes: true` for the completed story
6. Append your progress to `progress.txt`

## Progress Report Format

APPEND to progress.txt (never replace, always append):
```
## [Date/Time] - [Story ID]
- What was implemented
- Files changed
- **Learnings for future iterations:**
  - Patterns discovered (e.g., "this codebase uses X for Y")
  - Gotchas encountered (e.g., "don't forget to update Z when changing W")
  - Useful context (e.g., "the evaluation panel is in component X")
---
```

## USER REQUEST
{
  "id": "US-018",
  "title": "GitHub Copilot SDK setup and keytar token storage",
  "description": "As a developer, I need the GitHub Copilot SDK initialized in the main process with secure OS keychain token storage so that AI features can authenticate.",
  "acceptanceCriteria": [
    "keytar installed and imported in main process only (not renderer)",
    "ai.setToken tRPC mutation accepts { token: string } and stores it via keytar.setPassword('adiuva', 'copilot-token', token)",
    "ai.hasToken tRPC query returns a boolean indicating whether a token is stored",
    "On app start, main process reads the token from keychain and initializes the GitHub Copilot SDK client",
    "Settings dialog uses shadcn/ui Dialog (DialogTrigger as a SidebarMenuButton with Settings/gear icon in the sidebar footer); dialog content uses shadcn/ui Input for token paste + shadcn/ui Button to save via ai.setToken",
    "If no token is stored, AI-dependent features display a prompt using shadcn/ui Card with a shadcn/ui Button linking to the Settings dialog instead of throwing an error",
    "Typecheck passes"
  ],
  "priority": 18,
  "passes": false,
  "notes": ""
}