Function codeFromHttpStatus

src/lib/errors.ts:301–326

* Every facade-emitted HTTP status maps to a * known error code. When the envelope is missing or its `code` field is * unrecognized (proxy returned an empty body, content was mangled), we fall * back to the status-derived code so the retry budget and exit code match * what the contract promises.

(status: number | undefined)

 * what the contract promises.
 */
function codeFromHttpStatus(status: number | undefined): ErrorCode {
  switch (status) {
    case 400:
      return 'VALIDATION_ERROR';
    case 401:
      return 'AUTH_INVALID';
    case 403:
      return 'AUTH_FORBIDDEN';
    case 404:
      return 'NOT_FOUND';
    case 409:
      return 'CONFLICT';
    case 412:
      return 'PRECONDITION_FAILED';
    case 413:
      return 'PAYLOAD_TOO_LARGE';
    case 429:
      return 'RATE_LIMITED';
    case 501:
      return 'UNSUPPORTED';
    case 503:
      return 'UNAVAILABLE';
    default:
      return 'INTERNAL';
  }
}

/**
 * Detect the "insufficient credits" sub-case of a RATE_LIMITED (429) envelope.