fix(gopher): preserve partial state when EOF follows context cancellation

internal/protocol/gopher/gopher.go

@@ -231,6 +231,15 @@ func (p *Protocol) downloadText(ctx context.Context, reader *bufio.Reader, req *
 		line, err := reader.ReadString('\n')
 		if err != nil {
 			if err == io.EOF {
+				// The connection may have been closed by our context
+				// cancellation goroutine (or by the server after the
+				// client cancelled). If so, the EOF is not a genuine
+				// end-of-data but a side-effect of the cancel and we
+				// must persist the partial state before bailing.
+				if ctx.Err() != nil {
+					saveGopherResume(req, bytesWritten)
+					return nil, ctx.Err()
+				}
 				break
 			}
 			saveGopherResume(req, bytesWritten)