Create 2025-10-23-preview-url-default-behavior

[dinasaur404]

Summary

Add a changelog entry to communicate the recent update to how Workers Preview URL defaults are handled.

The new logic aligns the preview URL's default behavior with the workers.dev subdomain setting (when a preview setting isn't explicitly configured).

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.

[github-actions]

Preview URL: https://df36f62b.preview.developers.cloudflare.com
Preview Branch URL: https://dinasaur404-preview-url-changelog.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/2025-10-23-preview-url-default-behavior/	https://dinasaur404-preview-url-changelog.preview.developers.cloudflare.com/changelog/2025-10-23-preview-url-default-behavior/

[github-actions]

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

Pattern	Owners
/src/content/changelog/	@cloudflare/pm-changelogs, @cloudflare/pcx-technical-writing