Update web-enhanced self-reflecting agent notebook for new serperdev-haystack package

[julian-risch]

Related Issues

• part of https://github.com/deepset-ai/haystack-private/issues/369

Proposed Changes:

• update web_enhanced_self_reflecting_agent.ipynb for the new serperdev-haystack package: SerperDevWebSearch moved from Haystack core to haystack-core-integrations; import changed to from haystack_integrations.components.websearch.serperdev import SerperDevWebSearch
• fix pre-existing breakages found while running the notebook on haystack main:
  • add trafilatura and nltk>=3.9.1 to the install command (now required by HTMLToDocument and DocumentSplitter(split_by="sentence"))
  • replace the stale docs URL generators-vs-chat-generators (now a meta-refresh redirect stub that extracts to empty content and crashes the indexing pipeline) with choosing-the-right-generator

How did you test it?

• ran the full notebook locally (nbconvert + ipython) with a real SERPERDEV_API_KEY, local Ollama running gemma2:9b-instruct-q4_1, and serperdev-haystack installed from the integration branch: both queries complete; the second query exercises the web-search path via the new package

Notes for the reviewer

• serperdev-haystack is released on PyPI
• If there are any notebooks that you plan to drop anyway, let's see if that can be done before we create new integrations. Otherwise we'll try to make old notebooks work that will soon be deleted.

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