Changelog for AI Search indexing controls + rename user agent

[aninibread]

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/assets/images/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing
/src/content/docs/ai-search/	@rita3ko, @irvinebroque, @aninibread, @cloudflare/pcx-technical-writing
*	@cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://47ea38b9.preview.developers.cloudflare.com
Preview Branch URL: https://anni-ai-search-changelog-1.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/2026-02-09-indexing-improvements/	https://anni-ai-search-changelog-1.preview.developers.cloudflare.com/changelog/2026-02-09-indexing-improvements/
https://developers.cloudflare.com/ai-search/configuration/data-source/website/	https://anni-ai-search-changelog-1.preview.developers.cloudflare.com/ai-search/configuration/data-source/website/
https://developers.cloudflare.com/ai-search/configuration/indexing/	https://anni-ai-search-changelog-1.preview.developers.cloudflare.com/ai-search/configuration/indexing/