Add gitbook/expr package

[spastorelli]

Moving the @gitbook/util-expr private package to GBO repo so it can be shared between GBX and GBO.

[linear]

RND-7972 Move gitbook/util-expr to gitbook repo and publish to NPM

[changeset-bot]

🦋 Changeset detected

Latest commit: e8e98a7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@gitbook/expr	Major

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-6zkri505l-gitbook.vercel.app	✅
Cloudflare	https://77004794-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-6zkri505l-gitbook.vercel.app/url/gitbook.com/docs	https://77004794-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-6zkri505l-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://77004794-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	1 changed	Aug 25, 2025, 8:38 AM
v2-cloudflare (Inspect)	👍 Changes approved	4 changed	Aug 25, 2025, 9:03 AM
v2-vercel (Inspect)	✅ No changes detected	-	Aug 25, 2025, 8:55 AM