chore(opencode-sandbox): add SSH auth and workspace mount for Gitea

- Mount host workspace at /home/ga/workspace
- Add SSH key and known_hosts for Gitea auth
- Configure git user identity in container

AGENTS.md

@@ -9,7 +9,7 @@ This workspace is a monorepo containing data engineering projects and WhatsApp C
 ```
 workspace/
 ├── apps/
-│   ├── whatsapp-crm/      # Next.js CRM with Kanban board
+│   ├── whatsapp-crm/      # Next.js CRM with Kanban board (primary app)
 │   ├── whatsapp-sync/     # WhatsApp message sync service
 │   ├── whatsapp-reader/  # WhatsApp message reader
 │   └── timesfm-forecast/ # Time series forecasting app
@@ -52,6 +52,7 @@ npm run dev         # node --watch src/index.js
 npm run sync        # node src/sync.js
 npm run test        # Jest
 npm run test:watch  # Jest watch mode
+npm run test:coverage  # Jest with coverage
 ```
 
 ### whatsapp-reader
@@ -113,7 +114,6 @@ export async function POST(request: Request) {
   try {
     const body = await request.json()
     const validated = CreateContactInput.parse(body)
-    // ... process
   } catch (error) {
     if (error instanceof ZodError) {
       return Response.json({ error: error.errors }, { status: 400 })
@@ -138,14 +138,9 @@ interface Props {
 }
 
 export default function ComponentName({ contacts, onContactClick }: Props) {
-  // hooks first, then effects, then render
   const [state, setState] = useState(false)
 
-  return (
-    <div>
-      {/* JSX */}
-    </div>
-  )
+  return <div>{/* JSX */}</div>
 }
 ```
 
@@ -166,7 +161,6 @@ test('should update contact stage', async () => {
   render(<KanbanBoard {...props} />)
 
   await user.click(screen.getByText('Move to Next Stage'))
-  
   expect(onStageChange).toHaveBeenCalledWith(1, 'DECIDINDO')
 })
 ```
@@ -188,4 +182,4 @@ test('should update contact stage', async () => {
 - whatsapp-crm uses Next.js 14 App Router
 - Database is sql.js (WebAssembly SQLite) - runs in browser
 - Authentication uses WhatsApp Web.js QR code scanning
-- STAGES constant defines the Kanban pipeline (defined in `src/lib/types.ts`)
+- STAGES constant defines the Kanban pipeline (defined in `src/lib/types.ts`)