Headless engine does not save results at all in library mode

[awerqo]

There is a shared result-emit helper that writes through OutputWriter and fires OnResult on success:

katana/pkg/engine/common/base.go

Line 221 in 0f80ea8

func (s *Shared) Output(navigationRequest *navigation.Request, navigationResponse *navigation.Response, err error) {

Standard and hybrid engines call this helper. Hybrid for instance:

katana/pkg/engine/hybrid/hybrid.go

Line 239 in 0f80ea8

c.Output(req, resp, err)

The headless engine does not call Shared.Output(). Inside the RequestCallback closure it talks to the writer directly:

katana/pkg/engine/headless/headless.go

Lines 145 to 171 in 0f80ea8

	if err := h.options.OutputWriter.Write(req); err != nil {
	h.logger.Debug("failed to write navigation result",
	slog.String("url", func() string {
	if req != nil && req.Request != nil {
	return req.Request.URL
	}
	return ""
	}()),
	slog.String("error", err.Error()),
	)
	}
	}
	if !isUnique {
	return
	}
	if rr.Response != nil {
	rr.Response.KnowledgeBase = h.options.ClassifyPage(rr.Response.Body)
	if h.options.Options.OmitRaw {
	rr.Response.Raw = ""
	}
	if h.options.Options.OmitBody {
	rr.Response.Body = ""
	}
	}
	if err := h.options.OutputWriter.Write(rr); err != nil {