DOC: Enable Sphinx-Gallery example recommender

[kidusabe1]

Reference issue (if any)

Fixes #13864.

What does this implement/fix?

Enables the Sphinx-Gallery example recommender by adding "recommender": {"enable": True} to sphinx_gallery_conf in doc/conf.py. Each gallery page will gain a "Related examples" block at the bottom, computed via TF-IDF over example source text.

Additional information

• I verified against sphinx-gallery==0.21.0 that recommender is a valid sphinx_gallery_conf key and that {"enable": True} is sufficient — SG falls back to ExampleRecommender defaults (n_examples=5, min_df=3, max_df=0.9), which match what sphinx-gallery's own tinybuild uses. Happy to pin values explicitly if preferred.
• No dependency changes required: scikit-learn (the recommender's only extra dependency) is already in the doc group, and numpy is a core dep. I also checked that the new config passes sphinx.config.is_serializable, which is asserted at doc/conf.py:574.
• I didn't attempt a local full doc build for this change (config-only, and the full build needs the sample data + sphinx env). Could a reviewer please confirm the CircleCI doc artifact shows a "Related examples" section at the bottom of a gallery page? Happy to adjust parameters if output looks off on smaller subsections.
• First-time contributor — added name to doc/changes/names.inc and used :newcontrib: in the changelog fragment per the contributing guide.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Enables Sphinx-Gallery’s example recommender in the docs build so gallery pages show “Related examples” based on TF‑IDF similarity.

Changes:

• Turn on the Sphinx-Gallery recommender via sphinx_gallery_conf.
• Add contributor to names.inc.
• Add a changelog fragment announcing the doc enhancement.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
doc/conf.py	Enables Sphinx-Gallery recommender in sphinx_gallery_conf.
doc/changes/names.inc	Adds the contributor’s name/link.
doc/changes/dev/13867.other.rst	Adds a changelog entry for the new “Related examples” feature.

[Copilot]

Enabling the Sphinx-Gallery recommender generally adds a hard runtime dependency on scikit-learn during doc builds and can noticeably increase gallery build time/memory (it needs to vectorize example sources). If this repo has any doc-build paths that don’t install the full doc extras, this can cause build failures. Consider enabling this conditionally (e.g., only when scikit-learn is importable, or behind an env var used by CI) and/or setting the recommender parameters explicitly to keep behavior stable across sphinx-gallery version changes (e.g., n_examples, min_df, max_df).