(new): expand runtime APIs

(fix): harden concurrent lifecycle
(tests): add regression coverage
(doc): update v1.2 guidance

tgapi/uploader_api.go

@@ -156,7 +156,7 @@ func (r UploaderRequest[R, P]) doRequest(ctx context.Context, up *Uploader) (R,
 		resp, err := up.api.client.Do(req)
 		_ = requestBody.Close()
 		if err != nil {
-			return zero, fmt.Errorf("HTTP upload request failed: %w", err)
+			return zero, fmt.Errorf("HTTP upload request failed: %w", redactHTTPError(err, up.api.token))
 		}
 
 		body, err := readBody(resp.Body)