AHC errors have bad `.localizedDescription` (always claims `error 1`)

I'm using a library that unfortunately does logger[metadataKey: "request.error"] = .string(error.localizedDescription) where the error is an error out of AHC. The result is that it always prints

request.error=The operation couldn’t be completed. (AsyncHTTPClient.HTTPClientError error 1.)

Note that error 1 is produced regardless of the actual error.

The source of the problem is this oddity in Swift/Foundation:

import Foundation

struct MyError: Error & CustomStringConvertible { var description: String { "hello" } } 
print((MyError() as Error).localizedDescription)

// produces: "The operation couldn’t be completed. (MyError error 1.)"

Start by tracing AsyncHTTPClient.HTTPClientError and its error-description behavior, then reproduce the reported localizedDescription output in Swift/Foundation. The fix is complete when AHC errors expose their actual error details instead of the generic “error 1” text; no test file is named in the issue.