Function get_ref 

pub async fn get_ref(
    __arg0: State<App>,
    tn_id: TnId,
    __arg2: OptionalAuth,
    __arg3: Path<String>,
    __arg4: OptionalRequestId,
) -> ClResult<(StatusCode, Json<Value>)>

GET /api/refs/{ref_id} - Get a specific ref by ID

Returns full ref details if authenticated, only refId and type if not authenticated.