ci: add ci workflow to detect missing redirects

[lennessyy]

What was changed

• Adds a ci workflow to detect changed/moved pages without redirects

Why?

• To prevent unintended 404s from popping up when pages are moved

Checklist

1. Closes

2. How was this tested:

• Ships with unit tests.
• You can test by moving a page and expect the CI item to fail if you don't create redirects. The CI check is not required in case you have intentional 404

3. Any docs updates needed?

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
temporal-learning	Ready	Preview, Comment	Jun 3, 2026 9:25pm

[angelazhou32]

Thank you!