ci: Add CI validation for changeset package names and update style guide with new sections and AGENTS.md reference.

[jpoehnelt]

No description provided.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 924f8c4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.