Deference reusable content at the API level

[SamyPesse]

Demo

You can see the issue RND-8768 on https://gitbook-open-e2e-sites.gitbook.io/reusable-contents/
and fixed on https://gitbook-v2-eep7gqtc5-gitbook.vercel.app/url/gitbook-open-e2e-sites.gitbook.io/reusable-contents

Tasks

1. Implement new data API to fetch a document page with reusable content dereferenced
2. For a % of traffic, use it instead of the old method
3. If JSONDocument.meta.token is defined, used this to resolve content-refs within the document

[changeset-bot]

⚠️ No Changeset found

Latest commit: f1bc099

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

[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-nxit8enlo-gitbook.vercel.app	✅
Cloudflare	https://33ed32dc-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-nxit8enlo-gitbook.vercel.app/url/gitbook.com/docs	https://33ed32dc-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-nxit8enlo-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://33ed32dc-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

The latest updates on your projects. Learn more about Argos notifications ↗︎

Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	46 changed	Jan 23, 2026, 8:34 AM
v2-cloudflare (Inspect)	👍 Changes approved	42 changed, 4 added	Jan 23, 2026, 8:38 AM
v2-vercel (Inspect)	👍 Changes approved	45 changed, 4 added	Jan 23, 2026, 8:38 AM