Second Brain production API verified working

## Tests Run (2026-02-14)

### Auth Test
```
GET /api/auth/me → 200 OK
{authenticated: true, agentId: "bob", permissions: [read, write, delete]}
```

### Read Test
```
GET /api/memories?limit=5 → 200 OK
Returned memories with project and type info
```

### Write Test
```
POST /api/memories → 201 Created
Memory created with auto-generated embedding
```

### Semantic Search Test
```
Query: "how do we save conversations automatically?"
Result: Found matching memory about conversation capture with 0.55 similarity score
```

## Vercel Env Fix
Had to add SUPABASE_URL (non-prefixed) because PUBLIC_SUPABASE_URL not available in $env/dynamic/private.

## All Systems Go
- ✅ Auth with API keys
- ✅ CRUD operations
- ✅ Auto-embedding on write
- ✅ Semantic search via pgvector