curl -X PATCH https://app.okrapdf.com/api/v1/collections/col-abc123 \
  -H "Authorization: Bearer okra_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name": "Q4 2025 Earnings", "description": "Updated description"}'

{
  "id": "col-abc123def456",
  "name": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "description": "<string>",
  "metadata": {}
}