Namespace Virtufin.WorkManager.Components

SourceCredentialResolver: Resolves the effective AuthenticationHeaderValue for a code source fetch (WorkManager.FetchFromUrlAsync) from a per-request Virtufin.WorkManager.Protos.SourceCredential, replacing the former RegistryAuthHandler -- a DelegatingHandler registered unconditionally on the CodeFetcher IHttpClientFactory client and applied to every request whose host matched, regardless of whether the caller actually wanted the org credential used. Credentials are now explicit and per-request: a directly-supplied Basic/Bearer secret, or a named reference resolved server-side (see ResolveNamed(string, string, out string?)) so that secret never has to be distributed to callers.