namespace Kbx.Shared.ExternalData;
public interface IKrxApprovedServiceNormalizer { string ServiceId { get; } string NormalizerVersion { get; } object Normalize(ReadOnlyMemory<byte> payload); }
public sealed class KrxApprovedServiceNormalizerRegistry(IEnumerable<IKrxApprovedServiceNormalizer> normalizers)
{
    private readonly IReadOnlyDictionary<string,IKrxApprovedServiceNormalizer> map=normalizers.ToDictionary(x=>x.ServiceId,StringComparer.Ordinal);
    public IKrxApprovedServiceNormalizer GetRequired(string serviceId)=>map.TryGetValue(serviceId,out var n)?n:throw new InvalidOperationException($"No approved KRX normalizer is registered for service '{serviceId}'. Universal KRX field mapping is intentionally not guessed.");
}